BlueDevil Head Gasket Sealer

NCB_38386BlueDevil Head Gasket Sealer (#38386) will repair and seal leaks in blown head gaskets, warped or cracked heads, heater cores, and freeze plugs. BlueDevil contains no solid or particulate matter, and will not clog or harm your engine. It bonds to metal, aluminum, cast, alloy, or plastic, and it’s safe and easy to use. BlueDevil is compatible in gasoline and diesel engines. It stops leaks permanently. Our article on the symptoms of  a blown head gasket is a good starting place to correctly identify your gasket issues.

  • Permanent repair for Head Gaskets, Warped or Cracked Heads, Heater Cores, and Freeze Plugs
  • Contains no solid or particulate matter that can harm a vehicles engine
  • Alternative solution for costly and time consuming repairs
  • Safe and easy to use

 

 

For More Information, Please Visit: BlueDevil Products: Head Gasket Sealer

 


BlueDevil Head Gasket Sealer

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182 responses to “BlueDevil Head Gasket Sealer

  1. why does the 16 oz bottle not say” to remove thermastate” , and the 32 oz bottle does? doesent make since to me. product works great! must say the money back guarentee made the differance to try it. cant waste money on a fixed income. also it means you stand buy your product. hard to find real quality anything these days.I will always recomend this product.this is my first time to comment on any product.its that good.im sure your products will go far.

    1. Thank you so much for your comments!

      In regards to the Head Gasket Sealer, you may use either product. The “Pour N Go” (16 oz./white label) is a less concentrated formula that does not require the removal of the thermostat or a flush of the cooling system prior to use. The “Pour N Go” was specifically formulated so that it was an “easy to use” product and through testing we were able to develop a formula that didn’t require the removal of the thermostat but still carries a high success rate. Whereas the “Mechanic Approved” (32 oz./yellow label) requires both the removal of thermostat and a flush before applying the product; the 32 ounce is the more concentrated formula.

      The product with the yellow label (32 ounce) will give you best overall results as long as you can remove the thermostat and flush the system prior to use.

      Feel free to contact us with any questions.

      1. I have a 2005 Toyota 4Runner V6 and the thermostat is built into the housing and the hose connection, the thermostat cannot be removed. Can I still use the yellow label product? I have already purchased it. Thanks

        1. The way you can get around the housing is by taking a old thermostat and modifying it so that the middle piece does not close; you may remove, or gut, the middle of the thermostat. By doing so you will create a free flow and still be able to have the full housing installed.

          Once the process is complete you will need to replace the thermostat.

          Feel free to contact us with any further questions.

      2. So do you put the thermostat back in after you run through the BlueDevil process? I’m a novice about automobiles and looking for very specific instructions about using BlueDevil w/a 2003 Ford Expedition.

        Thanks
        Joe

        1. Joe,

          I would encourage you to give our Tech Line a call at 1.888.863.0426. They are available to help you with any specific questions in regards to the installation process. I’d recommend doing this prior to installation. If you don’t get a live rep, leave a message! They WILL call you back, usually within a few hours at most.

          -BDP

          1. Brandon-

            In order to get the benefit of the product, the vehicle would need to be able to idle for a full 50 minutes, without overheating or stalling out. Unfortunately, the car would not be a good candidate if the vehicle is unable to start.

            Thank you!

            -BDP

        1. Yes, our products carry a success rate over over 90%. We offer a money back guarantee for the small percentage of customers that they do not work for.

          Feel free to contact our tech support team at 888.863.0426 with any further questions.

          1. i have a 1998 pontiac sunfire. i took it to the garage and they told me that it was the head gasket. how long does it take to change one of these, and how effective is your product?

          2. Jennifer,

            Replacing your head gasket is a very timely job. Our products are very effective and carry a money back guarantee. If you have more questions regarding the installation process please give our tech line a call at 1.888.863.0426.

            Thanks,
            BDP

      3. I have a 1999 honda passport with the v6 .I just purchased the Blue devil yellow lable and flush online but now I just realised that half of the engine has to come apart just to remove the thermostat. I can bypass the heater core but it is so much work to remove the thermostat that I may as well just change the gasket or is it possible to us the yellow lable without removing the thermostat?

        1. Richard-

          For best overall results the thermostat should be removed when using the 32 ounce BlueDevil (yellow labeled) Head Gasket Sealer. If it is going to be difficult to remove then you would be better off using the BlueDevil Pour-N-Go Head Gasket Sealer due to the fact that it does not require the removal of your thermostat.

          -BDP

      4. What do I do if water leaked to the oil?? Do I have to do an oil change before doing the flush?? Or can I do the flush and sealant before an oil change?

        1. Alex-

          Yes, you may still use the BlueDevil Head Gasket Sealer to seal the leak(s). For best results, you will want to change the oil before and after the BlueDevil process.

          Thank you for your question!

          -BDP

      5. I do not know a lot about cars and have done the test with he radiator cap off and it erupts like a volcano.I can’t afford the $2500 or more to replace the gasket, and I know I can’t remove all the stuff it says to so is it OK to use the 16oz or should I find some to help remove the thermostat and use the 32oz? There is no smoke /steam coming from the exhaust

        1. Mike,

          Thanks for your question about your blown head gasket. If your vehicle is a 4 or 6 cylinder than it should be fine to use the 16oz BlueDevil Pour-N-Go to seal your head gasket leak. If you have an 8 cylinder vehicle then we would recommend using the 32oz BlueDevil Head Gasket Sealer.

          Let us know if you have any more questions!
          -BD Auto Pro

        1. Cornell-

          It wouldn’t necessarily do any harm in the cooling system, however, you would be limiting what the product would be able to do. The reason for flushing the radiator is to ensure you are performing the BlueDevil process in a clean, free-flowing system. Also, the BlueDevil Head Gasket Sealer (32 oz. yellow label) is specifically formulated to run with water in the system. Feel free to contact our technical support line at 888-863-0426 with any other questions.

          Thank you!

          -BDP

        1. Tanasha-

          Thank you for asking about your Ford Taurus. Please contact our technical support line at 888-863-0426 so that we can get a better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

          Thank you!

          -BDP

  2. This product flat out works. I had a rebuilt motor that for whatever reason started to overheat after 8,000 miles. Air was getting into the cooling system to the point that the vacuum was displaced by that air so coolant was not returning to the radiator from the overflow tank. Followed the instructions including removing the thermostat and flushed through about 15 gallons of water through the system. Put in straight water and ran it for 50 minutes. It passed three tests; the block test, the champagne test and a two hour road test. Magic!

  3. I’m trying to use the pour-n-go on a 1986 isuzu trooper, but every time I start the engine without the radiator cap on, coolent shoots out of where the radiator Cap should go. Am I supposed to be pouring it into the reservoir or directly into the radiator? If I’m supposed to pour it into the radiator I don’t understand how its possible to do so.

    1. If your vehicle has a reservoir rather than a radiator cap, instead of pouring it through the reservoir, with the car off and engine cold, you may add the product through the top radiator hose. Once it has been added reconnect the hose and start the idle from that point.

      Based on what you have stated, it appears that you are getting combustion gases blowing back into the cooling system creating pressure and causing the coolant to blow out through the top of your radiator. To give yourself the best overall chance of the product working successfully, in addition to the directions, I would remove the spark plug from the cylinder with the leak. To find the “bad plug” you may pull all of the spark plugs, you should notice one will have a white-crystal-like substance on it and/or may look dirty; this is the plug you should pull. Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and allow the product to seal properly.

      1. I have a similar problem. I know its a gasket leak and I am trying to apply blue devil because I cannot afford the hardware fix. But when I start my car and turn the heater on the radiator fluid is not being sucked through the engine and at first back flows through my radiator cap and overflows. Is this the same issue with combustion gasses causing to much back pressure?

  4. Went I take the thermostat out to flush leave it off for good are put it back went I use blue devil head gaskets sealer

    1. You will leave the thermostat out for the full 50 minute idle with the BlueDevil. Once the idle is complete you will then shut the vehicle off and allow it to cool for at least 2 hours. After it has cooled, you may then reinstall your thermostat.

  5. I used another brand sealer first(I dident hear of your product yet).
    will Blue Devil work if I use it after I flush the system?

      1. I never could really believe it until I saw it. BLUE DEVIL HEAD GASKET SEALENT WORKS! No BS, I have a 1999 Cadillac Deville that was starting to vent coolant out the exhaust, skipping badly, and a flashing check engine light for a bad misfire.
        After the proper flushing of the system and adding the Blue Devil( (properly)) it cleared up before my eyes. The next day after a test drive it ran like it was brand new. No codes at all, and no skip at all. My temps never went above 193 even at idle.
        For all of the people who say it can’t work, Face it. Your dead wrong. Follow the directions right and it will work. I have to admit I did not think it would work. I stand corrected. Thank you Blue Devil! You now have a loyal customer for life.

        Mike Baker
        Watertown NY

  6. THANK YOU THANK YOU THANK YOU a 1000 times thank you for this product! I was all set to do a head gasket replacement on a 2000 Ford Ranger with 170000 miles that ran good but would not pass smog in California. It had a head gasket leak around cylinder #5. I ran across videos of Blue Devil gasket sealer on youtube and started checking into it. I found that it was a well known “secret” among the used car dealers and mechanics in the area. The bottom line is that it worked just like it said and was easy and inexpensive to use. My truck passed smog and runs better than ever!!! I will definately put the word out that this is a fantastic product. Thanx again from a very satisfied customer!

  7. I am trying this on another Cadillac Deville after working fantastic on my first one. This one is a 2000 the last was a 99. While I was letting it idle for the required 50 min at around the 48 min mark it went into the red. Should I wait to flush the product and let it cool off and run it again? Or should I still flush it. I could not test drive do to the running in red.

    1. Yes, you should allow the vehicle to cool down completely (at least 2 hours) before driving or running it any more. Once it has cooled you can then take it on a test drive to see where it’s at. It is possible that it has still worked properly even though the vehicle was starting to heat up toward the end of the 50 minutes.

      Once the vehicle has cooled and you have a chance to drive it let us know if the vehicle is still experiencing any symptoms. If not, you should be good to go.

  8. my car is 2003 vanture van.3.4L engine .sympttailpipeoverheat, combustion gas went into coolant, coolant wont return. presure in coolant is higher than nomal , the heater hose is very hard when squizz. now the symptom is more offen. in first 5 min driving , overheat,pull over , and turn off engine, opened air blizz valve to get air out. opened cap of radiator ,let cooant ho back to radiator, then it is ok to drive more than 50km ,even in highway. next day, same problem. i thought :after i start engine, combustion air or gas went into coolant. after the engine was heat up, the leak stopped or particularly stopped. I guess.didnot notice big white smoke came out from tailpipe.
    question: is blue devil can fix this small leak?
    thanks.

    1. As long as it will idle for a full 50 minute period without overheating or stalling out you should have no problems. I would also recommend removing the spark plug from the affected cylinder to reduce the pressure buildup within the cooling system. Removing that plug will relieve a majority of the compression blowing into the cooling system and and allow BlueDevil a better chance at sealing.

      If it isn’t able to run for that period the BlueDevil may not have a chance to work properly.

      Please contact us with any further questions.

      1. I have a 2000 Chevy Cavalier. I tried the Blue Devil today. After about 30mins, the car overheated. Is there a chance the blue devil won’t work now? Im letting it cool down.

        1. Latoya-

          If it was unable to run the full recommended 50 minutes without overheating then there is a chance that it may not work. Please contact us at 888-863-0426 and we would be happy to discuss your vehicle and a possible solution.

          Thank You,

          BDP

  9. When I use this, after the initial 50 minutes of running, does the water / B/Devil chemical mix remain in the system ? Can it remain in the system to plug “future leaks” ?

    Is there any point in removing the mix (after the treatment) and letting the system cure “dry” ?

    1. It may remain in the system but it does not continue to seal. However, once sealed it creates a permanent repair. There is no reason to let the system air dry.

      Feel free to contact our tech support team at 888.863.0426 with any further questions.

  10. I have a blown head gasket on a Chevrolet diesel truck. I read the advice on how to add sealer when the radiator doesn’t have a cap by adding the sealant to the top radiator hose. I also have combustion gasses coming through my cooling system. How do I locate and disable the cylinder when there is no spark plug?

    1. You are correct in pouring it through the top hose rather than the reservoir. However, due to the fact that your vehicle is a diesel it has glow plugs rather than spark plugs. You will be unable to disable the affected cylinder. Therefore, we would not recommend running the BlueDevil with your specific situation.

        1. Jeff-

          The BlueDevil Pour-N-Go Head Gasket Sealer is intended for use in 4 or 6 cylinder engines, so one bottle would not be enough for your v8 diesel. Feel free to contact our technical support line at 888-863-0426 with any specific questions.

          Thank you!

          -BDP

  11. I poured it directly into the overflow rather than pulling the radiator hose. Will I be ok? Also, what is a “compatible antifreeze to use with this once I restore my thermostat and refill the system?

    1. The best method is pouring directly through the radiator hose when you only have access through the reservoir. It should still work but for future reference we recommend using the top hose. You can use any factory recommended anti-freeze.

  12. Used 32 oz. Head gasket sealer in 97 Gm pickup. 350 v-8 w/ ac. Still have water in oil. Added water during 50 minute idle. Should I use more than one bottle and NOT add water during idle? Cooling capacity is 5 gallons.

      1. Of course I changed the oil. Why wouldn’t you just say change the oil and ….Whatever your advice would be??

  13. I have an 89 Buick century sedan, I found out it was an head gasket issue, there was some oil in the reserv overflow, however…no white smoke out the tail, but the engine does run very rough.
    I purchased the Headgasket sealer, but a “mechanic” told me I didn’t have to change out the thermostat.I already have the new thermostat part ready to be installed by someone that knows how, I think he did’nt want to do it because he had said earlier to me that mine was hard to get to.
    he added it, but when I went to pick up the car…the car was off!
    I went ahead and took my car home, let it idle for an hour and an half, shut it off and started it later on that day, and at first it sounded like a brand new engine! Like a new car really.
    I drove it, and it rode like a dream.
    Later on that day–it was in the 90’s in florida–I drove to walmart….and the car was smoking some around the engine, and it started running a little rough again, like it was overheating too a little.
    My questions are:
    I know I need to have that thermostat installed, but should I also add another bottle of bluedevil?
    someone said to me that could lock my motor up? is that true?
    what about that pour-n-go? is that safer? should I use that now?
    I really need my car, and I cannot afford a regular repair. What Should I do?
    Thanks in advance—-Vo

    1. Unfortunately, BlueDevil is not intended for situations were oil has entered the cooling system. Please contact 1.888.863.0426 to discuss your situation in greater detail with our tech department.

  14. I have a 2003 toyota camry 4 cylinder with a blown head gasket due to the cooling failure when the water pump went. I used the 16oz bottle and it fixed 2 of the 3 cylinder misfiring. Then I decided to try one more 16oz. hoping to fix the remaining problem. It still has the problem of misfiring in one cylinder after the first test drive. Any suggestion, the car will run but not 100% due to the one cylinder not working. Thanks and I will really appreciate your help. God bless.

  15. Hi. A friend of mine told me that I had a blown head gasket. Okay….so..he put the blue devil in, but I don’t know much about cars, so I do not know what else he did. I drove my car home about 20 min away…car still overheated…few days later…test drove…overheated and white smoke still…..A week later, I started my car, no smoke no overheat but still running rough and I put in drive and cut off. I have a 2004 Toyota Solara. Is it possible that Blue Devil did not work? Maybe problem was too severe, but I am very happy no more white smoke that fills up my neighborhood 🙂

  16. I have a 4 cyl 97 honda accord. I found oil in the water and the techs at work told me it’s the head gasket. I’ve heard great things about blue devil and am about to attempt to use it. However, I’m going to use the 16oz bottle because i dont really have enough money for the 32. But i heard the 32 is more concentrated. Does that mean the 16 oz wont work for as many miles as the 32? I had the same problem with a 98 mercury sable and used some off brand sealant for the local auto parts store. It ran for at least 20,000 miles and would have gone farther if I hadnt ran it with ice in the lines (ran out of coolant a day before the first frost of the year. How many miles can i typically expect to get out of the 16 oz bottle. I dont drive aggressively and only about 25 or 30 miles a day. Id appreciate any input. I hope this works.

    1. Unfortunately, BlueDevil is not intended for situations where oil has entered the cooling system. We recommend getting a hard part repair in a situation like the one you have described.

  17. 91cCr7l657O6 IM going to use the blue devil yellow label 32 oz in my vehicle do I need to flush afterwards before adding coolent the instructions say no but I read that it will gel up the system if any is left in.

    1. No, you do not need to flush the system afterward. Once the BlueDevil process is complete and the engine has cooled you may simply drain the cooling system and refill with the factory recommended antifreeze. There is no risk of “gel” forming within the system.

      Feel free to contact our tech support team at 888.863.0426 with any further questions.

  18. Hello,I bought today,8/29/2013,a bottle of the 32oz blue devil,I have a 2001 Chev s10 with a 2.2 in it,apparently it has a bad head and the compression goes to the radiator,so for what I have been reading I have to remove one of the spark plugs in order to successfully complete the process,my question is,what happens if the truck starts running hot after 10 min of running it?will my four cylinder still run without one of the spark plugs?

    1. In order for BlueDevil to work properly the vehicle must be able to idle for a full 50 minute period without stalling out or overheating.

      Based on what you have stated, it sounds like the vehicle is getting combustion gases blowing into the cooling system creating pressure and causing the coolant to blow back out through the top of your radiator. To give yourself the best overall chance of the product working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak. If you pull all of the spark plugs, you will notice one will have a white-crystal-like substance on it and/or may look dirty; this is the plug you should pull. Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product to seal properly.

      Before using the product we recommend that you pull the plug from the affected cylinder and then run the vehicle to see if it will maintain an idle for 50 minutes. You should only use the product if the vehicle is able to run for the full 50 minutes.

      Feel free to contact us with any questions.

  19. We recently bought our daughter a 2000 Grand Am GT 3.4 automatic, private party sale. One month into owning this, after discussing symptoms and location of a coolant leak with a mechanic brother of mine, we suspect it has a LIM gasket leak. Will this product work for that? We can NOT afford to pay upwards of $1000 to replace the gasket. We should have researched this vehicle more thoroughly, but ran a carfax that came back clean, so we felt confident in the purchase. Arg! We’re hoping for a fix that will get her through 2 years of high school.

    1. Yes, the BlueDevil Head Gasket Sealer will work for a leaking Intake Manifold. Feel free to contact our tech support team at 888.863.0426 if you have any questions regarding the install.

    1. Yes, BlueDevil Head Gasket Sealer will work in this situation. However, you will need to change the oil before and after the process. If you need further assistance, please call 1.888.863.0426.

  20. Will bluedevil work for my 1995 sedan deville 4.9 liter? Its over heating and has anti freeze leaking out of tail pipe. Had headgaskets heads n gaskets replaced, but believe mecahic didnt tighten gaskets at correct tork r sequence. Cant pay for another head gasket job.

    1. Corey,

      Yes, the BlueDevil Head Gasket Sealer would be appropriate to help remedy the slight coolant leak(s) on your Cadillac. Feel free to contact us at 888.863.0426 with any further questions.

      Thanks,
      BlueDevil Pro

  21. My thermostat assembly has no gasket without the thermostat installed. When i run the blue devil through the block for 50 minutes, a small amount of fluid will seep out the seam of the assembly. Is this ok or should I stick the rubber ring from the thermostat inside the assembly before i do the 50 minute cycle?

    1. jflo,

      So we can get you going in the right direction, please call our Technical Support line and ask for Zach. He’ll be able to offer some more information based on your car in particular.
      1.888.863.0426

      -BDP

  22. Hi, question, I´m in Mexico right now and I have blow head gasket, SO I whent to Auto Zone and get your prodect for head gasket sealer, just i like to know if first i do have to remove the oil mixes w/water and put a new oil, or justo put in the sealer whit the oil like that. Thanks

  23. Hi guys,
    I suspect that I’m getting exhaust gasses passing into the radiator on ’87 Celica (3SGE engine). It’s not so bad yet … Which product would you recommend?

  24. Wow – what a product. I have an old 1999 Plymouth Voyager Van with 175k miles on it that I use occasionally for picking up wood for my woodworking shop. Around 4 weeks ago it started to overheat with the symptoms of a leaking head gasket. The vehicle is not worth doing a head job on so I thought I would try a sealant first. Initially I used one of your competitors (well known) products and it did not work a hoot. I was about the get the vehicle towed to the breakers yard when I thought I would have one last repair attempt using your product after seeing it on You Tube. I followed the instructions exactly and with no real thoughts of success started the vehicle. After 50 minutes of idling guess what – no overheating. I then drove for the vehicle for over 50 miles and it drove spot on with absolutely normal temperatures. Blue Devil has given my old van some more life! This product works fantastic and I highly recommend it. Many Thanks to the Blue Devil team.

  25. I decided to try your product on my 2002 Pontiac Grand Am 3.4L , I had a cold start misfire problem and this morning it didn’t go away like normal . I did some tests and determined it had a blown head gasket so i went down to AutoZone and bought a 16 oz pour and go bottle . I let the car completely cool down and poured it through the top hose and started it . within less than 5 minutes the misfire went away, I let it run at idle for about an hour and so far it seems to have fixed the problem . I will see how things go for a few days and let you know. Thanks for a great product. well worth the $38 if it holds up.

  26. I have a 97 Chevy Malibu and having misfires and head gasket problems. My vehicle was juddering, engine light flashing and rough idling. I took my vehicle for scanning and received codes P0300 + P0302. To my understanding cylinder #2 has issues. I checked the dipstick the oil looked like mud and oil cap looked like mayonnaise. I know there’s a hole in the head gasket, maybe near cylinder #2. Would your product seal the head gasket? As I’d been hearing good things about your product. Please advise.

    Thanks,
    Alex

  27. I have a 2000 Ford ranger xlt V6 3.0 with water and white smoke coming out of the tail pipe, yes one of the wires from the spark plugs has some dried up mud like residue, and white crystal like substance around where the spark plug goes. Will Blue Devil stop that problem?
    I would appreciate your answer pretty much. Thank you, and my god bless you.

    1. Based on what you have stated, it appears the vehicle is getting combustion gases blowing into the cooling system creating pressure and causing the coolant to blow back out through the top of your radiator. To give yourself the best overall chance of the product working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak. It sounds like you have clearly located the “dirty” plug; this is the spark plug you should pull. Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product to seal properly.

      Feel free to contact us with any further questions.

  28. I didnt take out thermastat when i put the yellow label blue devil sealer. I poured product directly into hose that leads to radiator and when reached normal operating temp i poured some into overflow tank will it still work?

  29. hi, i just bought some of the yellow label blue devil, and i have one question, i am a bit confused about the thermostat issue..after letting it idle for 50 minutes do i take it for a test drive or let it cool down and replace the thermostate? do you replace the thermostate before or after the test drive and how long od a test drive do you take?.thanks

    kent

  30. I completed the directions. My question is… Can I leave the water/sealant in the motor for the next 24 hrs or do I have to replace the water/sealant with antifreeze? Will the water/sealant freeze. Temperature will drop to 15’F.

  31. I have a 94 ford explorer I used the seal and go product. I followed the instructions as stated. After the 50 minute idle period we changed the oil cause it had coolant in it. I did this at a auto shop in the lot. After that I drove my vehicle home 10 miles, it ran great. I didn’t drive my explorer again until the next day. I woke up and got ready to go to work at the ski resort. On the way to work in the snow storm my vehicle overheated coolant bubbling from the top of the radiator cap. I was able to get my car running again and drove it back to town. Now the radiator leaks a bit, my oil is coffee colored and I pour out white exhaust more than before. I am willing to try your product again. I feel that when I drove it home from the shop that was my mistake. I was wondering if that is where I messed up. What should I do different next time I use the product. I need my car running as soon as possible. Thank you for your help!

  32. I have a 1994 Ford Bronco XLT. For the model year, the mileage is exceptionally low (averaging approx. 7500/ yr), only 150k miles on a 20 year old truck. I blew my head gasket last weekend subsequent to spending a night stuck in a glorified puddle after trying to pull a friend loose. After a basic garden hose test of my radiator, I believe my gasket failed secondary to critical fluid levels, potentially due to damage to the lower radiator hose. I have purchased Blue Devil Yellow Label. The truck down idles frequently, and I am concerned as to whether it can idle for 50 minutes. Will the product still perform if I have to restart the truck or add additional water/ coolant during the process? Also, will 1 quart of product be sufficient to seal both the head gasket and the radiator hose leak?

    1. For proper results, your Bronco should be able to idle a full 50 minutes and not lose more than about 1 quart of water during the idling. You will only need one 32 ounce bottle of BlueDevil to treat your vehicle.

      If it is unable to maintain an idle for 50 minutes then it may be a little bit too large of a leak for this to work properly. I would base your decision on whether to use it or not of whether or not it can maintain an idle for that period of time.

  33. Hi I have a 99 seville sts with the northstar 4.6l v8. I flushed the coolant system with autozones clean and flush per there products directions. With water in engine and their flush, it was boiling out of the reservoir. it did not do this with the coolant in it prior to draining. I have flushed and drained the system and im leaving it with no liquid in it overnight. What do you suggest I do to stop the boiling? Thermostat is removed. Thanks

    1. Based on what you have stated, it appears the vehicle is getting combustion gases blowing into the cooling system creating pressure and causing the coolant to blow back out through the top of your radiator. To give yourself the best overall chance of the product working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak. If you pull all of the spark plugs, you will notice one will have a white-crystal-like substance on it and/or may look dirty; this is the plug you should pull. Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product to seal properly.

  34. The coolant in the car is rusty brown in color a few days after doing a flush. There is a light brown colored residue stuck under the coolant cap. The coolant smells like exhaust, but there is no pressure or bubbling at the tank as far as I can see. With a new thermostat it blows coolant out the cap at random times. With the thermostat removed the car runs fine with temperature in the correct range. The plugs all look fine. Compression shows 175 lbs in 6 of 8 cylinders and 155 lbs in the remaining two adjoining cylinders. There is no sign of coolant on the dipstick or oil filler cap and there is no excessive steam out of the exhaust.

    In one of your earlier posts, you said the product would not work if oil is in the coolant. I think the rusty brown color indicates there is some oil in the coolant. I am wondering if I should give the blue devil sealer a try or wait for the problem to get worse.

    1. If the brown residue you are seeing is in fact oil within the cooling system then you are correct, the product will not work. You may want to confirm on whether or not that is the case and if it is not oil then we would recommend the use of BlueDevil.

      In the case that it is not engine oil within the cooling system, there is an additional direction you may take to improve the success of our product. Because you are getting exhaust gases blowing into the cooling system you should remove the spark plug from the cylinder with the leak. If you pull all of the spark plugs, you will notice one will have a white-crystal-like substance on it and/or may look dirty; this is the plug you should pull. Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product the best shot at sealing properly.

      Feel free to contact us with any further questions.

    1. Yes, but you will need 1.5 bottles (48 oz.) of BlueDevil Head Gasket Sealer for the application. Please call tech support at 888.863.0426 if you have further questions.

  35. I used blue devil head gasket sealer yesterday on my car. I was told to let it dry for 48hr without starting the car. Do I need to let this stuff dry?? I used the 32oz bottle

  36. I have a 98 Honda Accord. Over the past 4 months on a warm start my car has had trouble starting. The car rumbles for a few seconds then is normal. I believe it is trouble with one of the cylinders. I took it to Big O and they took out all of the spark plugs and started the car and fluid gushed out of one of the cylinders, which means there is a leak in the block. I do not have any noticeable gasses coming out of the exhaust. Can this problem be fixed with Blue Devil and if so, will the pour and go be a suitable option?

    1. As long as the vehicle will start and be able to idle for a full 50 minute period without stalling out or overheating then you should have a great chance at this working properly. You may also want to make sure that you will not lose more than 1 quart of water during the 50 minute idle.

      If your vehicle is able to stay within those two guidelines you should have no problem sealing the leak.

  37. I have a 02 Duramax diesel. What are the procedures for using the head gasket sealer? I don’t want to make any mistakes on using. Once I have flushed the system and ready for Blue Devil, do I just pour into a empty system, or do is put water in first? After the 40 minute running time and then cool down, do,I drain and install coolant? Thanks!

  38. I put blue devil in my 2001 Cadillac devil and started to let my engine idle. after about 15 to 20 minutes my car started overheating. I shut off the car to let it cool down. is it going to hurt my car if I did that?

    1. The product will not harm your engine in any way. However, if the vehicle was unable to idle for the full 50 minutes then that may be an indication that the leak is too large for BlueDevil to work properly.

      Please contact our warranty department at 888.863.0426

  39. hi i purchased the yellow label bottle and i was unable to finish the 50 min run in time due to a minor failure in my rtv. i was wondering if theis was going to pose a problem in my near future.

    1. For best results, the vehicle should idle a full 50 minutes without being shut off in between. It will not cause any harm if did not run the full 50 minutes but you may not get the full benefit from the use of the BlueDevil Head Gasket Sealer.

  40. On a 2002 Cadillac Deville DTS I followed all the directions on the 32oz bottle after 35 to 40 minutes my car ran completely hot…..was that suppose to happen or something else is wrong

  41. I have a Mercruiser 4.3 V6 that was “rebuilt” last year and this year it seems to have a problem with water getting into the cylinders. I haven’t checked the plugs yet to see which cylinder is the culprit yet but water is getting in somehow. It could be a head gasket, worse a cracked head, or even worse a cracked block. Which of these problems will your product repair? Also what would be the procedure to use your product on an open loop cooling system that uses lake water?

    1. Clay-

      First of all, in order to use the product you will need to create a closed loop cooling system. The BlueDevil Head Gasket Sealer will work in any of the instances you have listed. However, you will need to first be sure you can somehow create a closed loop.

      You may contact us at 888-863-0426 with any questions.

      -BDP

  42. I used the 16oz bottle on my 2002 Nissan Altima 2.5 and the seems to have fix the head gasket but my car over heats now. I hope this didn’t ruined my new thermostats.

  43. I have a 2000 bmw 740il with head gasket issue’s. I bought the blue 32oz bottle, follow all instruction. I only used half a bottle of blue devil. The car seems fine for the first 2 days, but now it’s blowing smoke from the exhaust again after parked for 2 hours. Should I pour the remaining half bottle in? I haven’t installed the thermostat, and I didn’t pour any coolant in the radiator yet, so should I add more blue devil? If so, how much more? What the correct amount for 2000 bmw 740il.

    1. Using 1/2 of the bottle is the correct application for your BMW. It sounds like you had some temporary improvement after the initial application but some of the symptoms have since returned.

      We would recommend that you apply the 2nd half of the bottle. You will want to drain the system down and refill with water prior to adding the 2nd dose. The thermostat should remain out for the idling process.

      Feel free to contact us at 1.888.863.0426 with any further questions.

  44. I have a Toyota truck with a rebuilt 22RE engine. My problem is not head gasket leak, but it is the gasket between the water pump and timing chain cover.
    It is a paper type gasket. It runs fine and no misfires or anything but a drip leak out of the mentioned gasket. Will this stuff repair this gasket if I follow the directions on your site?
    I already have the thermostat removed & no need to flush…radiator is brand new.
    Thanks

    1. Jacob-

      No, BlueDevil is not intended to fix this type of leak. It sounds like you may need to replace the water pump. Unfortunately, in this instance we would recommend a hard part repair.

  45. I have a 2002 Toyota Avalon. It has been over heating and we have replaced the spark plugs, all 6 coil packs, the coolant tank, radiator, and thermostat. Thus, we have come to the conclusion that there is an issue with our head gasket. When trying to use Blue Devil to fix our issue the car started overheating again, right around 25 minutes the car began to overheat again. Should we let the car run through the rest of the 50 minutes or let it cool down before we continue?

    1. Victoria-

      You do not want to let the vehicle to continue its run if it is overheating. Running a vehicle at these high temperatures could potentially cause further damage.

      If the vehicle will not idle for a 50 minute period without overheating then it may just be too large of a leak for BlueDevil to work properly. Please contact our warranty department at 888-863-0426 and we would be happy to assist you in getting reimbursed.

  46. I used blue devil yellow label a while back, I need to use it again but don’t feel like removing thermostat and flush, can use the pour and go or is ti bad to mix them?

    1. Daniel-

      You should drain your system down completely and refill it. Once you have done so you may go ahead and use the BlueDevil “Pour N Go”. One bottle is good for a 4 or 6 cylinder vehicle.

  47. My 2002 Kia Rio has gotten hot several times. At least 6 times. I could hear water boiling until I finally found a small hose leaking water. Then, coolant fan would not turn on. Now, randomly, car does not idle well, idles at 2000 rpm, and drive a few days and starts to idle normal. Strange situation. Could it be a warped head, don’t see water in oil or oil in water.

    1. Mike-

      Yes, it is possible that you have a warped or cracked head. You may want to have the vehicle further diagnosed so that you know exactly what you are dealing with.

      If you do find out that it is a warped or cracked head then you would be able to apply the BlueDevil Head Gasket Sealer.

      Feel free to contact our technical support team at 888-863-0426.

      -BDP

  48. I have a ’96 CD5 Honda Accord that I had recently found out has a possible blown head and/or cracked cylinder head (compression test results in cylinder 1 pushing 180lbs). My mechanic had let me know that repairs are going to be somewhere in the $1500 range. Given that my car is well over a decade old, I was looking at two choices, 1) Invest over $1000 into a car that already has over 200,000 miles on the motor and chassis and maybe drive it around for another 2 to 3 years before it craps out or 2) Sell the car as is with a blown head gasket and maybe get $500 for it. I bought Blue Devil as a last resort, and based off consumer reports it was one of the leading brands when it comes to leaky head gaskets and cracked cylinder heads, plus with the money back guarentee I really had nothing to lose. I just installed Blue Devil product yesterday, and I’m very happy to be in that percentile where I can honestly say so far Blue Devil has saved my car! I had followed the instructions to a T, which I believe some people that have had bad experiences with Blue Devil or similar products, failed to do thus resulting in dissapointment. Prior to installation, my radiator fluid would have to be replenished at least once a day, if not 2-3 times a day depending on that days usage. After yesterday, the coolant levels are stable, theres no water or smoke exiting the tail pipe and my car no longer idles rough (Accord is a manual 5 speed, and before Blue Devil I’d sometimes have to lay on the throttle at a dead stop just above 2000 rpm, enough to keep it from idling rough and dying which it has before at a couple red lights). It is too soon to saythat it was a complete success for a fact, but I’m definetly not skeptical of the product considering it has already shown outstanding results. Thanks Blue Devil!

  49. Hi, I poured in the blue devil head gasket sealer. i ran it for 50min without a thermostat. I’m wondering if i can put the thermostat back without draining whatever is left of the blue devil in the system?

  50. I used the Pour-N-Go in my 2002 Jeep Liberty and it seemed to work for a couple of days. The only real symptom I have is the check engine light (P0303 code) and some coolant in my oil. I want to use it again because I put it in the reservoir rather than the top hose of the radiator. Will I need to flush the cooling system to remove the product that is in there or can I just add another bottle?
    Also will removing the spark plug from the 3rd cylinder really increase the chances of success?

    1. Melody-

      Please contact our tech support team at 888-863-0426 so that we can discuss your vehicle in more detail and recommend the best steps for getting the leak stopped. We look forward to hearing from you.

      -BDP

  51. Corvette with1200 horsepower is what the engine produced. Using twin turbos. Creating 25 pounds of boost through a 7 liter v8. If you can imagine the amount of stress on the gasket. Its probably 10x that. This engine was worth $80,000. Under a full throttle run, the interior sleeve that holds the pistonit cracked right down the side and blew the head gasket on in the same swipe of fate. The car was bleeding coolant profusely. Smoking milky oil. The whole nine yards.

    I flushed the engine Religiously. To the point where you could drink the water then I changed the oil. I put Blue Devil In the system and let the car idle for an hour . The smoking from the tail pipes Went away the remainder of the moisture in the engine dissipated with heat. Into our absolute shockt

    The engine was like new.

    We took it out on the road andall for s**** and gigges and did a full throttle run at 25 pounds of boost which produces 1200 horsepower and ran it up to a hundred and fifty miles per hour. No smoke no anything. Car ran absolutely incredible

    Saved 10,000.00 dollars by using this amazing product. And to think it was under $70 bucks!!!!!!!!!!! Money back guarantee ain’t nothin better than that.

  52. I have a 2003 Audi a4 1.8t 3 days ago I turn my car in and It shows me Tht my coolant is low wasn’t getting heat quickly. Later on in the day I started to see white smoke.while driving the car I don’t see the smoke but as long as u stop the smoke comes out a lot it also gives off a scent of the coolant . For me the coolant tends to run down very fast I have witness the temperature gauge went to red for the very first time appreciate if u can tell me what’s wrong and if it’s the head gasket going bad and if so which would be the right product to use

    1. Aaron-

      You may use either Head Gasket Sealer. The “Pour N Go” (16 oz./white label) is a less concentrated formula that does not require the removal of the thermostat or a flush of the cooling system prior to use. Whereas the “Mechanic Approved” (32 oz./yellow label) requires both the removal of thermostat and a flush before applying the product; the 32 ounce is the more concentrated formula.

      The product with the yellow label will give you best overall results as long as you can remove the thermostat and flush the system prior to use. With the use of either product, be sure to follow the guidelines for the proper amount to use. Based on your capacity, you will be using 16 ounces either way. I would still use a flushing agent to flush your cooling system prior to using the product to ensure proper results.

      -BDP

  53. I have 2005 Duramax LLY Diesel engine getting high pressure in cooling system. Will not bleed off over night. Looks like it may be Head casket or Head. Will your product help and if so. How do It.

    1. Jerry-

      In a gasoline engine we would recommend pulling the spark plug from the affected cylinder to help relieve the pressure while BlueDevil was being used in the cooling system. However, you will not be able to do so on your diesel so we do not recommend using the BlueDevil Head Gasket Sealer in this instance. It will work on a diesel when you have water going into the oil or coolant leaking out through the exhaust (white smoke) but not with the combustion gases blowing into the cooling system.

      -BDP

    1. Sharita-

      Yes, you can definitely still use the BlueDevil Head Gasket Sealer and have success. You will want to change the oil before and after the BlueDevil process to ensure proper results.

      Thanks,

      -BDP

  54. After taking the thermostat out and loosing some of the liquid (Blue devil + water) , can I replace the lost fluid with antifreeze 50/50, or does it have to be water? I actually did top it off with antifreeze, will this damage my vehicle or the cooling system?

    Thanks

    J Russell

      1. I had the same question…does the Blue Devil/water mix have similar properties to a 50/50 coolant mix? Would it be safe to have, say, 10% standard coolant and 90% of the remaining Blue Devil solution as functional coolant?

        1. Kurt-a

          The BlueDevil Head Gasket Sealer does not have any properties of antifreeze. The product only reacts to heat once, after that it becomes inert. So once you have completed the 50 minute idle and shut the vehicle off, any extra BlueDevil in the system would be like water at that point. You can either drain all of the contents out and start over with fresh water and antifreeze or drain about half of the contents out and just add antifreeze for your 50/50 mix.

          Thank you!

          -BDP

  55. I have a 99 chevy blazer. With a intake leak i have to put water in it every other day will blue devil fix my leak or do i need to replace the gasket right away.?

    1. Jay-

      Yes, the BlueDevil Head Gasket Sealer will seal the leak to stop your water loss. We have successfully used it to fix leaking intake gaskets in the past.

      Thank You!

      -BDP

  56. I have a 2005 Chevrolet Silverado 2500 with the 6.6l Duramax. I am getting some internal coolant loss. No signs of running hot or tail pipe blow by. I do have a loud exhaust leak type noise that i was told was a small leak in the headgasket. It does not drip.

    Will this product work for that repair?

    If so, how is it done since the radiator has no fill cap only a reservoir to add coolant.

    1. Andrew-

      Yes, we do recommend using the BlueDevil Head Gasket Sealer based on your symptoms.

      Since your truck only has a reservoir/overflow rather than a radiator cap, instead of pouring BlueDevil through the reservoir/overflow, with the car off and engine cold you should disconnect the top radiator hose and add the product there. Once it has been added reconnect the hose and start the idle from that point.

      Feel free to contact us with any further questions at 888-863-0426.

      Thanks!

      -BDP

  57. it worked for me, saving me fifteen hundred dollars. Thanks so much Blue Devil. I ran it for a full hour, because after fifty minutes, I could see a small amount of smoke still coming out of the exhaust pipe, ten xtra minutes did the trick,. NO smoke, sealed everything perfect !!! This might buy me an extra year before getting a new vehicle or a new engine!!!! 🙂 very satisfied.

  58. I just had my car diagnose & found coolant mixed in the motor oil due to defective head gasket also found oil in spark plugs due to defective value cover gasket. Will the bluedevil pour & go head gasket sealant work & If i .use the bluedevil pour & go head gasket sealant will i still pass smog & is it permanent.

    1. Nicole-

      Yes, we do recommend using the BlueDevil Head Gasket Sealer. For best results, you should change the oil before and after the process.

      If you are failing smog because of the steam coming from the tailpipe, due to the antifreeze leak, then this will help you pass your emissions test.

      Thanks!

      -BDP

  59. I have a 2005 F250 6.0 diesel. It seems to be pressuring the cooling system. Will the 32 oz bottle work on this?

    1. Corey-

      If it were a gasoline engine we would recommend pulling the spark plug from the affected cylinder to relieve some of the pressure. However, this is not be possible on a diesel engine. For that reason, we would not recommend using the product for your application.

      The BlueDevil Head Gasket Sealer will work on diesel engines and higher compression engines but not when you are getting combustion gases pushing back into the cooling system.

      Thank You!

      -BDP

  60. I have a 99 oldsmobile silhouette with a blown head gasket and I was wondering since my husband replaced the water pump, radiator, heater hoses, and bottom hose should we bleed the air out of the system before we use Blue Devil? We tried to bleed the system before and it’s blowing back

    1. Beatrice,

      Thanks for your question about your Oldsmobile Silhouette. You should bleed the cooling system as much as you can before you add BlueDevil Head Gasket Sealer to ensure you get the best seal on your head gasket leak. First make sure you’ve removed the thermostat as instructed in the BlueDevil Head Gasket Sealer directions. Then, refill your system with water. With the thermostat removed, it will only take about a minute of idling to remove all the air from your system. Once that is complete just follow the directions from there!

  61. how can I use your product I have a 2004 Durango and when I remove the thermostat all the water runs out can I use it with thermostat in or what do I do

    1. Ron-

      The way you can get around the thermostat with a housing is by taking the thermostat and modifying it so that the middle piece does not close; you may remove this piece or gut the middle of the thermostat. By doing so you will create a free flow and still be able to have the full housing installed. Once the process is complete you will need to replace the thermostat.

      Thank You!

      -BDP

  62. I have a ram 1500 with the 4.7 v8. I wanted to know if I could use two bottles of the 16oz pour n go head gasket sealer as I do not have the time or money to flush my system.

    1. Shayn-

      Yes, you can still use the BlueDevil Pour-N-Go Head Gasket Sealer for your Dodge Ram 1500 but, you would need at least two bottles of the product. The amount of the Head Gasket Sealer used would be determined by the vehicle’s cooling system capacity. If the capacity is around 4.5 gallons, then two bottles would be enough. If the capacity is closer to 6 gallons, that would require three bottles. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  63. I have a 2003 Subaru Legacy. I replaced the head gaskets because I had coolant in the oil. The gaskets fixed the coolant and oil issue but now I have exhaust gases coming through the radiator. I get very tiny bubbles at idle but will run without overheating. When I drive the vehicle it overheats within 5 minutes and blows the coolant reservoir cap off. I checked all of the spark plugs and they all look like new. How do I find which cylinder is leaking? Thanks.

    1. Frank-

      If you have checked all of the spark plugs and they appear ok, we recommend having a compression test performed. Whatever cylinder is reading with the lowest pressure, that is the spark plug you will want to have removed for the 50 minute idle. By keeping that spark plug out for the BlueDevil Process, it will reduce the amount of pressure building up in the cooling system, and allow the product to circulate and seal properly.

      Thank you!

      -BDP

  64. Do I leave all the plugs in while using your product…I have a 95 grand Marquis and coolant is sitting in 2 of the plug holes.do I take them out while using the product before I pour the product in..n pressure is in my overflow making it bubble..and my car runs like crap with white smoke coming out the tail pipe.. and I want accelerate over 10 mph..would this really fix my problem..my car been down for 4 months I miss it..glad I have 2..but I need this one also..please help

    1. James-

      Based on your description, it sounds like your vehicle may be getting combustion/exhaust gases blowing into the cooling system and creating pressure. To give yourself the best overall chance of BlueDevil working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak; this will be the spark plug from the cylinder with a low compression reading. If you are not sure which one that is, you may pull all of the spark plugs and will sometimes notice one will have a white-crystal-like substance on it and/or may look dirty; this is the plug you should pull. Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product to seal properly.
      If your vehicle only has a reservoir/overflow rather than a radiator cap, instead of pouring BlueDevil through the reservoir/overflow, with the car off and engine cold you should disconnect the top radiator hose and add the product there. Once it has been added reconnect the hose and start the idle from that point.

      Thank you!

      -BDP

  65. Just finished the 32 oz process on a 2002 Cavalier 2.2. Symptoms were typical…burning coolant in the combustion process with the billowing white smoke and gloppy, coolant-infused oil in the crankcase. Fortunately, the thermostat is easy to get to, although with the gasket being integral to the thermostat housing, I ended up gutting the old one to maintain seal and still allow free flow. I flushed the system, filled with water and added the Blue Devil. After about 10 minutes, I noticed that the low coolant light was on…I misjudged during the fill process and had not filled the system completely. I let it run the 50 minute course anyway and did not add any more water for fear that the cold water would affect the thermal properties of the process. I shut it down and went to work. Upon my return, I topped up the system and ran it for another 50 minutes while noticing a slow trickle from the head for the first couple of minutes. The second run did the trick and after a couple of test runs, the system is tight.

    Things that I believe contributed to the success of the application:

    Thorough cooling system flush.
    Completely full system on the second try.
    Allowing the product to sit outside so the temperature was the same as the water in the cooling system before application. it was a chilly morning and there would have been a 20-30 degree differential.
    Also found it helpful to use 50/50 oil and Marvel Mystery mix with new filter to clear the sludge from the engine. Drain again, another new filter and straight oil.

  66. I have a 2002 malibu which had an overheating issue. My son in law replaced the thermostat, coolant resevoir cap, coolant flush, changed the oil, replaced hoses, exhaust manifold gasket. It run good on test drive. He now informed me it has a slight coolant leak n white smoke out of pipe. Will this work on my car. Will the pour-n-go work?

    1. Pat-

      Based on your description, we would recommend using the BlueDevil Pour-N-Go Head Gasket Sealer. As long as the vehicle can idle for 50 minutes without overheating or stalling out, and you are not losing more than about a quart of water/coolant, you should be able to see some good results from the product.

      Thank you!

      -BDP

  67. i have a 2002 honda accord 4 cylinder 2.3L. i drove this car home from work one night and all it overheated. so when i arrived i turned the car off and something told me to go back outside and try to start it up. and it just cranked and didnt start. i was told by a mechanic that i had to replace the cylinder head gasket. do you think Blue devil will be helpful now?

    1. Brandon-

      Thank you for asking about your Honda Accord. In order to get the benefit of the product, the vehicle would need to be able to idle for a full 50 minutes, without overheating or stalling out. Unfortunately, the car would not be a good candidate if the vehicle is unable to start.

      Thank you!

      -BDP

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