How To Fix A Coolant Leak?

Coolant LocationBefore we get to how to fix a coolant leak, let’s talk about why it is important to fix your leak quickly.  If your car is leaking coolant, it will run normally until the coolant level gets too low.  Once it is low, there will not be enough coolant to keep your engine at the normal operating temperature and the engine will over heat.  For more information about the dangers of an overheated engine, read our blog here: https://gobdp.com/blog/car-overheating/

Fixing your coolant leak quickly will ensure your vehicle has the proper coolant level to stay cool and safe.  Coolant leaks can come from a variety of places in your vehicle and where the leak is will dictate the best solution.

Possible Coolant Leak Locations:

  1. Hoses
  2. Thermostat
  3. Heater core
  4. Radiator
  5. Head gasket

There are at least 4 hoses associated with the cooling system in your vehicle, but possibly many more.  There will be a hose that carries coolant from the bottom of the radiator into the water pump and another hose that carries coolant from the top of the engine back to the radiator.  There will also be hoses that carry coolant to and from the heater core, which is most likely located under your dashboard so the hoses will travel from the motor back to the firewall, or the rear of the engine bay.  Overtime due to heat and age the ends of those hoses can become brittle and begin to crack where they are attached causing small leaks.  In this case, the best thing to do is purchase a new hose and clamps and replace the broken hose.

The thermostat is usually on the top on the engine, but in cases, as in many Subarus can be located on the bottom of the engine.  It’s likely near the water pump and is closed in a housing that is near one of the hoses going to the radiator at the front of your vehicle.  This housing is usually bolted on so that it can be easily removed if you need to replace the thermostat.  It is possible that the thermostat housing can develop a leak where it is bolted together.  In this case, consider replacing the thermostat housing gasket.  Since you already will have it apart, consider replacing the thermostat as well since it is a relatively inexpensive part.

As discussed above, your heater core is located under your dashboard near the cabin ventilation fan.  Warm coolant from your engine is pumped through the heater core, then your cabin ventilation system uses that to heat the air in the cabin of your vehicle.  If the heater core is leaking you will find coolant on the floorboards of your vehicle, most likely on the passenger side.  Removing the heater core can be an expensive and tedious job requiring the removal of a significant portion of the interior of your vehicle.  To repair the leak in your current heater core use BlueDevil Pour-N-Go.  BlueDevil Pour-N-Go is a non-particulate chemical based leak sealer that reacts at the temperature differential created at the leak point in your cooling system.  BlueDevil Pour-N-Go will create a chemical weld at the leak permanently sealing the leak in your heater core without expensive removal.  Simple add BlueDevil Pour-N-Go to your vehicles radiator and allow up to 2 days drive time for the leak to seal.

You Need To Know How To Fix A Coolant LeakIf you discover a radiator leak you can repair it by using BlueDevil Pour-N-Go to seal that leak in just the same way.  Since your radiator is in the front of your vehicle and a relatively fragile piece of equipment it is no unusual for it to get holes from rocks or road debris.  BlueDevil Pour-N-Go can save you from the costly repair of purchasing a new radiator.  Pick up BlueDevil Pour-N-Go directly from BlueDevil here.

You can tell if you have an external coolant leak from your head gasket if you discover coolant leaking from bellow your exhaust or intake,(we also have a whole post dedicated to other blown head gasket symptoms).  External head gasket leaks must be sealed very quickly as they will expand overtime if they are left untreated.  If you have an external head gasket leak use BlueDevil Head Gasket Sealer.  BlueDevil Head Gasket Sealer can seal the head gasket leak even in vehicles with large cooling capacities, like V8 engines or truck engines, and is powerful enough to stop even large leaks.  You can purchase BlueDevil Head Gasket Sealer here.

BlueDevil Pour-N-Go Head Gasket Sealer

BlueDevil Pour-N-Go and BlueDevil Head Gasket Sealer are guaranteed to seal your cooling system leak easily and permanently without costly replacements or mechanics bills. You can purchase any Blue Devil products from our partnering local auto parts retailers like:

  • Pep Boys
  • Car Quest Auto parts
  • NAPA
  • AutoZone
  • O’Reilly Auto Parts
  • Advance Auto Parts
  • Bennett Auto Supply
  • Prime Automotive Warehouse

Pictures Provided by: www.artofmanliness.com and www.arrowheadradiator.com

112 responses to “How To Fix A Coolant Leak?

  1. I used this for the coolant leak I have in my head driver side cylinder 3 no it would only leak a little I would have to fill my reserve every 1000 miles after I used this (I heard nothing but good about this stuff .) now I have steam that comes out after it sits 10 to 15 min when hot if it sits over night it will blow it all out from what got in it over night so it made things worse now its never done this before and I fallow the instructions to a t I just thought you guys should know it suck because this is my only means of transport this is a 97 ranger 4.0 pickup

        1. Sabrina-

          We really don’t manufacture any products that are intended for antifreeze leaks coming from one of the cooling hoses. Your best bet would be to drain the system and replace to hose that has failed.

          Thank you!

          -BDP

    1. 96 Chevy lumina , car leaking antifreeze and steam coming from behind the engine block , only runs hot when coolant is all gone ,it started out slow leaking and fine ,now it leaks faster what could this be ? N will this fix it ?

      1. Rob-

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

        Thank you!

        -BDP

  2. Do I have to drain the car of any remaining coolant first before adding the sealant? If so, where can I find the radiator cap? It appears my car doesn’t have one.

    1. Claire-

      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.

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

      Thanks!

      -BDP

  3. Hi
    I have loss of coolant. At first there were no visible signs, but now its dripping out of my exhaust. I have no white smoke coming out or coolant in oil or oil in coolant. Only thing I can think of is a blown head gasket or cracked head.

    1. Luke-

      We agree, it does sound like you are experiencing the early signs of a blown head gasket. We recommend adding the proper amount of the BlueDevil Head Gasket Sealer to stop the coolant loss and prevent the problem from becoming worse.

      Thank You!

      -BDP

        1. Kim-

          Please contact our technical support line at 888-863-0426 so that we can get a little more information about your vehicle and see if it is a good candidate for the product.

          Thank you!

          -BDP

      1. My 2002 dodge ram is leaking look likes between the pulley n water pump..but I replace the water pump 4 months ago.I try putting water but won’t hold it for to llong.wat can it be …? Plz help

        1. Javier-

          Thank you for asking about your Dodge Ram. Based on your description, it sounds like you may be losing water a little too quickly for the BlueDevil Head Gasket Sealer. In order to get the benefit of the product, the vehicle would need to be able to maintain idle for a full 50 minutes, without overheating or stalling out, and you shouldn’t be losing more than about a quart of coolant/water.

          Thank you!

          -BDP

  4. MY CAR COOLENT ARE leaked but i dont know why the coolent are lleaked
    the temprature meatre of the car are on above than a middle level

    please give me a suggetiuon whaaaaaaat can i do for this problem.

    1. Aeadhya-

      We recommend adding the proper amount of the BlueDevil Head Gasket Sealer to help stop the coolant leak you are experiencing.

      Feel free to contact our tech support team at 888-863-0426 for more information about the product and how it works.

      Thank You!

      -BDP

      1. I HAVE A 2006 CROWNVIC AND I TRIED ADDING BARS LEAK TO MY RADIATOR FLUID BECAUSE I THINK MY HEATER CORE IS GOING OUT BECAUSE I HAVE STEAM COMING FROM MY HEAT VENTS IN CAR CAN I STILL USE Blue Devil if I already added something?

        1. Mandy-

          Thank you for asking about your Ford Crown Victoria. Based on your description, we recommend flushing the cooling system thoroughly with a radiator flush http://store.gobdp.com/radiator-flush-00204/ prior to adding BlueDevil. Not knowing the chemical formulation of the previous product used, we would not recommend mixing the two. Feel free to contact our technical support line at 888-863-0426 with any other questions.

          Thank you!

          -BDP

  5. Juat got home n i heard a bubbling sound when I got off to check my car (06’dodge status)I noticed my car was leaking coolant n a lot..I had just filled it the day before..what do you think it could be,please help!

    1. Kendra-

      Please contact our tech support at 888-863-0426 (8:00 AM – 5:00 PM EST, Mon – Fri) so that we may gather a little more information about the symptoms you are experiencing. After getting a little more information we will be able to recommend some possible solutions to repair your Dodge.

      Thank You!

      -BDP

  6. I have a leak coming from where the coolant hose meets the overflow/resivore container. Will your product work in fixing this issue

    1. Robert-

      Unfortunately, the BlueDevil Head Gasket Sealer really isn’t intended for that type of leak. We recommend having the coolant line, that is leaking, replaced.

      Thank You!

      -BDP

  7. I noticed my temperature gauge is going all the way to the red and the red temp light comes on. The car goes into “limp mode” not going over 35mph. I noticed alot white smoke coming from the exhaust one time only, but last night i put coolant in and it sounded like it was pouring out from below the car. Can this sealer help me?

    1. Kelly,

      It does sound like you have a blown head gasket in your vehicle. Our most powerful head gasket sealer is available here: http://store.gobdp.com/head-gasket-sealer-38386/ and is guaranteed to seal your head gasket leak as long as you purchase BlueDevil Head Gasket Sealer from our online store or one of our authorized local auto parts stores listed here: https://www.gobdp.com/storelocator/. Make sure you follow the directions for BlueDevil Head Gasket Sealer exactly for the best results.

  8. I just bought a used van and I have to pour water in it everyday. About a half gallon. The dealer tells me it’s normal to be low and I know he is crazy. He had my van for 2 days and did nothing to it. Tells me nothing is wrong. I shouldn’t have to keep adding water to it if it’s fine. I know they did replace the head gasket on it before I bought it. Can you give me some advise? Thank you

    1. Cindi,

      Your engine coolant will get low over a period of time mostly due to evaporation of water from your overflow tank but if you are adding water every day then you certainly have a leak somewhere. For a quick read on how to find a coolant leak, try reading our article about coolant leak locations here: https://www.gobdp.com/blog/can-fix-coolant-leak/. Hopefully this will help you figure out where you coolant is going so you can come up with a plan to repair the leak.

  9. My car keeps overheating pretty much every time I drive it. I put water in it and drove around. It got all the way into the red, I opened the hood and saw that it was leaking from the overflow hose. Even coolant doesn’t last long in it. Can you help?

    1. Larissa-

      I would first start by having that hose replaced. Once the hose is replaced you can re-evaluate as to whether or not the vehicle is still losing coolant. If the car has overheated multiple times it is possible that it may have blown a head gasket due to running under extreme heat.

      Thank You!

      -BDP

  10. My 2004 Chev impala has a leak in the cooling system. Mechanic found it when changing oil. It does not use alot of antifreeze and temp gage stays below the middle mark. All of a sudden the air conditioner stopped blowing cold air from vents. Air is cold and I can feel it blowing a little but it don’t blow out any harder when I turn blower up from off to high. Could this be because of leak mechanic told me about?

    1. Thanks for your question about your Chevy Impala. It doesn’t sound like those two problems are related. As for the coolant leak, try BlueDevil Radiator and Block Sealer (available here: http://store.gobdp.com/radiator-block-sealer-00205/) to stop that leak to make sure your cooling system stays working properly and your engine stays safe.

      As for your air conditioning, it sounds like your problem is with the blower in your ventilation system rather than your air conditioning. The first thing you should check is your fuse for your blower motor. If the fuse for the blower is still good then you may have to replace the blower.

  11. Hello i have a question ive changed all my hoses because it kept over heating now its leaking the coolent where it looks like from under the water pump witch i just changed also ….what could be the problem and what can i do to close the leak .

    1. Rondyln,

      Thanks for your question about your water leak. Without being able to see where the leak is coming from, it is difficult to tell. If you reused any of the old hose clamps while changing your hoses your first step should be to get new screw type clamps and use those on the ends of all of your hoses. It is possible that while you were changing the hoses you loosened the water pump so you can try BlueDevil Radiator and Block Sealer to try and seal a water pump leak. BlueDevil Radiator and Block Sealer is available here: http://store.gobdp.com/radiator-block-sealer-00205/.

  12. I have a 2000 Jeep Grand Cherokee Laredo that is leaking coolant from the front right side…also there is water leaking from the front of the radiator. I went to Pep Boys and they sold me your head gasket sealer, but is this the right product to use for this problem? I also should mention that every day sometimes twice a day I have to refill the reservoir repeatedly. Please advise.

    1. Melissa-

      Yes, they recommended the correct product for your Jeep. The BlueDevil Head Gasket Sealer will seal the leak(s) so that you will no longer lose coolant. Feel free to contact our tech support team at 888-863-0426 with any questions.

      Thank You!

      -BDP

  13. My car never over heated but I was losing coolant I had to do this a couple of times even when It wasn’t being drove. But then about 2 weeks later after it just sat there I filled it up with water and turned the air on and then turned heater on for at least 10 minutes and I checked the water flow and it stayed full and never leaked at all I took it for a drive to try to get it hot but it never got hot and it never leaked 2 hours later I checked again still full and still no leaks. What is going on? and what could it have been? and should I go a head and drive it now?

    1. Debra-

      Yes, you can go ahead and drive it at this point. You may want to continue to check the coolant level regularly just in case. You should also always keep an eye on the engine temperature to ensure it is not rising above normal while being operated.

      Thank You!

      -BDP

  14. SO MY A C will not blow out cool or cold at all. my sons grandpa tried to put refridgerant in the car and said it” spuewed” out and after it smelled funny. my heat works great but i dont know if they are connected in any way. is there anyway u can tell me what this possibly could be.

    1. Britt-

      The funny smell may also be an indication of a leak in the evaporator. If you can find that your system pressure is low you can add BlueDevil Red Angel AC Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to seal the leak and get your system back to normal. If your system is over pressurized the only option is to have your system professionally evacuated and refilled with the proper amount of refrigerant.

      Thank You!

      -BDP

  15. I have a 1999 dodge neon, my problem is my coolent system builds to much pressure, I was told it was a bad head gasket that’s leaking exhaust fumes into my coolent system. Have you ever heard of this problem? And could your product help me? Thanks in advance.

    1. Patrick-

      Yes, we recommend using the BlueDevil Head Gasket Sealer.

      Because you may be getting combustion/exhaust gases blowing into the cooling system and creating pressure we have some additional steps 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.

      Thanks!

      -BDP

  16. My car overheated i let it sit and cool down then drove it about 10 miles and it was fine i then added water to the reservoir then drove about 20 miles and it was fine but after parked there was a small puddle under my car after about another 20 miles is overheated again and now there was smoke/steam. Please help

    1. Sarah-

      Please contact us at 888-863-0426 so that we can get a better idea on just how quickly you are losing coolant. This will help us make the best recommendation for getting your vehicle back on the road.

      Thank You!

      -BDP

  17. I have a 2002 jeep liberty and the heater core is leaking a clear oily substance. Which product of yours should I use?

    1. Donald,

      Thanks for your question about your jeep Liberty. If you are sure the leak is from the heater core, we would recommend using BlueDevil Pour-N-Go (available here: http://store.gobdp.com/pour-n-go-head-gasket-sealer-00209/). The other thing you might consider is having your cooling system flushed and new coolant added. Your coolant may be clear, but shouldn’t be oily and flushing it and adding new coolant will help your cooling system function more efficiently.

  18. My ford taurus is leaking coolant from under my car the man said it closer to the engine and trans witch he would have to remove in order to get to the problem will this product work

    1. Jalisa-

      Yes, we recommend adding 16 ounces of the BlueDevil Head Gasket Sealer to your Taurus. The product is specifically designed to stop coolant loss.

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

      Thank You!

      -BDP

  19. 2009 mustang has coolant leaking. Find it puddled under car, under motor in passenger side. But not from radiator. Maybe near thermostat. I replaced that, but still leaks. Major puddles. Have to add coolant every day. Burning smell after driving even for a few minutes. Noticed some coolant on other side of engine too. How can I tell where it’s coming from for sure and what could it be ?? Help. Desperate to not pay for a diagnostic test.

    1. Kelly-

      We recommend adding 16 ounces of the BlueDevil Head Gasket Sealer. This will help stop any coolant loss you are currently experiencing whether it is from the head gasket, a freeze plug, cracked block, radiator, or any other part of the cooling system.

      Feel free to contact us with any questions.

      Thank you!

      -BDP

  20. 2003 F150 King Ranch 5.4. Smelled antifreeze after a short trip to store. It took a gallon of both water & antifreeze. 2 weeks later again same thing. This time let truck sit for a couple of days. It started leaking with out being start. I see engine to front left a small amount of antifreeze around some thing going into engine with a plug connected. Its also under some type of long metal tube going towards back top of engine. Is this a gasket leak & what product would be best to use?

    1. Dwayne,

      Thanks for your question about your 2003 F150. The leak you’re describing does sound either like an o-ring leak, or gasket leak. For this type of leak we would recommend using BlueDevil Radiator and Block Sealer (available here: http://store.gobdp.com/radiator-block-sealer-00205/). It will bond to all metals or plastics ensuring it will seal your leak in this location. Make sure to purchase BlueDevil Radiator and Block Sealer from the link above, or one of our partnering local auto parts stores to make sure you get our guarantee!

      Thanks again for your question,
      -BD Auto Pro

  21. Hi. I drive a 2009 Dodge Charger. Once early this year it ran hot so I took it to dealership. They installed a new water pump. The car was okay except it started slowly loosing coolant. Maybe once every 3000 miles I added coolant. Well lately it ran hot again and I pulled over added water. I drove 10 miles and every 10 min I had to pull over cause my car was running hot so i sat for 30 minutes for it to cool completely. After it cooled i drove it on home but noticed smoke coming from the hood when i got home but while driving the Hot-Cold gauge did not move pass the half mark so I thought it was fine. I allowed it to cool for an hour. Then tried to take my daughter to work while sitting in parking lot I turned it off so it wouldn’t run hot but after minutes tried to start it and it would not start. Sounded like it was flooding and loosing power. well after hour of waiting it cooled and I drove home about 15 minutes away and as I was getting closer home smoke started to come from the Hood and it was driving roughly. I started to hear a small rattling noise. I made it home shut it off. The next morning I went to check it. It was strong started right up. I added Bars Head gasket sealant and antifreeze to the Reservoir jug well I was able to see it’s problem. Fluid started to pour from the thermostat housing leaking over on engine causing smoke and fluid start leaking from underneath car on front side by Reservoir jug and leaking under car toward middle by engine. I guess thats by the thermostat and water pump area. The Reservoir jug is still full cause some was flowing back in the jug. I can still see the coolant and bars sealant in the jug. My concern is the coolant pouring from the thermostat housing, which appears to be cracked and underneath the car. I saw a midst smoke and appears to be condensation coming from the exhaust pipe then it stopped. I checked oil dip stick it’s normal appearance. Can you help me? Which of your product can I use even if the other sealant seems trapped in the Reservoir Jug? Do i drain the jug first before adding anything new? Thank you.

    1. Casidy,

      Thanks for your question about your Dodge Charger. It sounds like your car over hearing on and off has caused a few things to crack, like your thermostat housing. It is possible that when your car overheated the first time and the water pump was replaced, the thermostat was damaged and has continued to cause overheating problems. Based on how quickly you saw leaks and how much coolant was coming out, we would actually recommend replacing the cracked components rather than using stop leak products. Cracks that big may not seal using a stop leak and will probably start to leak again soon after.

      Once the broken components are replaced we would recommend flushing your cooling system to remove any debris or old leak stop agents. You can use BlueDevil Radiator Flush (available here: http://store.gobdp.com/radiator-flush-00204/) to clean everything out.

      Thanks again for your question!
      -BD Auto Pro

  22. I have a 2002 jeep grand Cherokee leaking coolant, looks like its underneath radiator ( leak is in front area) I am refilling coolant reservoir every other day. Will your product help with this coolant leak?

    1. Susie-

      Yes, the BlueDevil Radiator and Block Sealer would be able to seal the leak you have described. As long as your vehicle can maintain an idle for 45 minutes, without overheating or stalling out, and your not losing more than about a quart of water/coolant in that 45 minutes, you would be a good candidate for the product. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  23. my daughter just bought a 1994 Honda Accord 4 cyl w/149300 miles, I brought it to shop to have a tune up and oil change and asked IF possible to check the timing belt. I then was told the water pump is leaking and being a Honda it isn’t really smart to change the pump only as the belt and it are pretty much together inside. The cost is $1010.00. I have driven the car. The temp gauge doesn’t go above the mid point even on the highway, though it was only driven for 45 minutes. And there is no evidence of antifreeze on the ground when I check. As a precaution, would it be doable to use your product?

  24. It’s kind of heard to explain. When the gas is being pumped (chevy Camaro) the tank is only excepting $8-10. It feels like there is pressure in there. Why is this? Thanks!

    1. B,

      Thanks for your question about your Camaro. Your problem could be happening for a few different reasons. Right next to the tube you put the gas pump into should be a smaller tube that allows air to escape from the tank while you’re pumping gas. Make sure that tube is free of debris and clear to allow vapors out. If you cannot see that smaller tube or it appears blocked you may have to drop your gas tank and remove the entire filler tube assembly to figure out what is blocked causing the pressure to build up. You can also try waiting a minute or 2 with the gas cap off after the gas pump stops automatically and try filling again to see if the pressure is relieved over time.

      Thanks again for your question!
      -BD Auto Pro

  25. I have a 1997 Dodge Caravan that I need to push for a couple more months:-) Earlier this summer car overheated for first time, towed to mechanic he replaced a couole of hoses and the thermostat…..said that eventually other hoses may leak……….its been overheating for a while………I add coolant to reverse 2X week and fill radiator with water almost everday. I called my mechanic and he recommended I get a new car……he wants to sell me one:-) Woukd any of your priducts work?

    1. Kathie,

      Thanks for your question about your Dodge Caravan. It would help if you could locate the leak to know which of our products to use, but for a mystery leak we would recommend using BlueDevil Pour-N-Go Head Gasket Sealer as it should seal head gasket leaks as well as other leaks. It’s very easy to use and should seal your leak quickly and easily.

      Thanks again for your question!
      -BD Auto Pro

  26. Hi, I have a 03 mountaineer V 8 4.6… it’s leaking underneath the thermostat housing and along the side by the plugs. Wanted to replace the thermostat housing but it’s together with upper intake. What could I use to help stop the leak since filing it up every morning?

    1. Leon-

      Based on your description, we recommend using the BlueDevil Head Gasket Sealer (32 oz yellow label). As long as the vehicle is able to idle for 50 minutes without overheating or stalling out, and you are not losing more than about a quart of water/coolant in that 50 minutes, you should be able to get some good results from the product.

      Thank you!

      -BDP

  27. I just bought a 05 Chevy trailblazer a week ago. I live in Arizona, so it’s hot. We got the pull changed and fluids topped off two days ago. After driving it 15 miles to school this morning everything still was fine until 2 pm this afternoon when I was told my car was leaking. Sure enough a large puddle running down the parking lot starting at the front of the car near the serpentine belt. It was dripping deep from 3 places (so it looked) ruining horizontally. The resivor (where you normally add coolant) was bone dry. I added coolant (full large bottle) and you could see it leaking right a way ( I did over fill it) I drove it about 10 minutes and it overheated. 15 min later I went to put water in it and it was not leaking and the Reservoir was full so I drove it for 20 min home (during rush hour) never went above the middle line (how it’s been since we bought it) got it home a d still no leaking and still full!!! I’m at a loss. Maybe a product like yours way used before we bought it and it resealed again? Is it safe for me to use your product if another was used before?

    1. Kris,

      Thanks for your question about your Trailbazer. Intermittent problems like you’re having are difficult to track down, especially not knowing the history of the car. We would recommend driving it for a few more days and keeping extra coolant with you to see if you can learn any more about what is going on. It should be safe to use BlueDevil Pour-N-Go to try and seal your leak unless it is coming from a coolant hose, as our stop leak products are designed to seal gasket and seal leak, not hose leaks.

      Thanks again for your question!
      -BD Auto Pro

  28. I have a 2000 ford Taurus I noticed a small leak of antifreeze a few months ago been putting coolant n water in it here n there as needed its never overheated I was driving on the highway and it the gage read hot and proceeded to make a knocking sound after a minute it died so I pulled over for a second and then started it back up got to work quickly 8 hours later it wouldn’t start well my brother went to get it had to flip the fuel switch in the trunk n messed with a spark plug it made it home I drove it about a mile then had someone tell me I needed new spark plugs new Thermostat in radiator cap my brother switched out 3 spark plugs input 50/50 in the overflow mind you my car has never smoked since I’ve had it and after he Changed 3 spark plugs and put antifreeze in it it started smoking a lot of white smoke from the tailpipe now it is not smoking at all what is the problem

    1. Katie,

      Thanks for your question about your Ford Taurus. Based on your description of events and the white smoke, it sounds like you blew your head gasket when your car overheated. If your car is a V6 we would recommend using BlueDevil Pour-N-Go Head Gasket Sealer (available here: http://store.gobdp.com/head-gasket-sealer-38386/) to seal the leak and stop the white smoke. Once you’ve sealed your head gasket leak you can change all the spark plugs and your engine oil and you should be back to normal.

      Thanks again for your question!
      -BD Auto Pro

  29. On my intake manifold of my 2000 Saturn there is a water outlet and it is cracked and leaking a pretty heavy flow of coolant.

    1. Nate-

      We would like to get a better idea about just how much water you are losing and how quickly. Please contact us at 888-863-0426 so that we may discuss your vehicle in more detail and whether or not BlueDevil would be a good solution for you.

      Thank you!

      -BDP

  30. Wondering if your product will work on my issue. My Xterra 2004 will leak coolant near the driver side only when the car is cool. I park it in the garage and no coolant is leaking if I check in two hours but it will leak when I check in the morning. No burning smell but just a tiny puddle under the car.

    1. RE-

      Based on your description, we would recommend using the BlueDevil Head Gasket Sealer. As long as you are not losing coolant/water too quickly and the vehicle is able to maintain an idle for 50 minutes, without overheating or stalling out, you should be able to see some good results.

      Thank you!

      -BDP

  31. I have a 2000 Ford Taurus SE it has never overheated on me before on my way to work and overheated very quickly so I pulled over because it was making a knocking sound no smoke or nothing I started back up and quickly make it to my job the next day it wouldn’t start I had to wiggle spark plugs and push the fuel button in the trunk it drove fine I got home figured I needed new spark plugs new radiator cap and new thermostat so I bought new spark plugs change the three front ones as soon as I put antifreeze in it my car started smoking white smoke out of the tailpipe so I shut it off every since I change the three front spark plugs and put antifreezeIn it IT will not drive I was told that it was an intake manifold what should I do

    1. Do I need to take the thermostat off and pour Blue Devil in the radiator hose or what I’m a single mother expecting a baby in February please help

      1. Katie-

        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. However, if the thermostat is difficult to remove or you would rather not then you can always use the “Pour N Go”. With the use of either product, be sure to follow the guidelines for the proper amount to use.

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

        Thanks!

        -BDP

    2. Katie,

      Thanks for your question about your Ford Taurus. It is possible that you have an intake manifold gasket leak, but most often after overheating and getting white smoke from the tailpipe the problem is a blown head gasket. If you can get your car to idle, use BlueDevil Head Gasket Sealer (available here: http://store.gobdp.com/head-gasket-sealer-38386/) to seal the leak. You do have to remove the thermostat to increase the flow in your system so BlueDevil can work, then simply pour BlueDevil Head Gasket Sealer slowly in your radiator while your engine idles.

      Thanks again for your question!
      -BD Auto Pro

  32. my 1992 Ford explorer sometimes leaks coolant from the overflow port located under the heater core. The radiator was recently flushed clean due to steam coming through the AC/heater vents when I didn’t have either on, and a friend suggested that the heater core could just be clogged up. And for awhile, it seemed to work. yet, today it released a lot of coolant. There is no indication that it is overheating, but I am still concerned about it leaking coolant. Is it possible that I put too much coolant after flushing it out, or is there a possible leak and what Blue Devil product would you recommend for sealing this leak? Thanks!

    1. Alicia,

      Thanks for your question about your Ford Explorer. The symptoms you’re describing are classic symptoms of a leaking heater core. As it is leaking, it’s is draining through your AC condensate drain or steaming through your vents. We would recommend using BlueDevil Head Gasket Sealer to seal the leak in your heater core.

      Thanks again for your question!

      -BDP

  33. I have a 2000 Jeep Grand Cherokee Laredo. When it hasn’t been started it holds the coolant in the reseviour and the radiator well but once it starts and I drive on it for a couple miles it starts to overheat rapidly. I then have white steam coming from the front passenger side and a slight drop under the front of the radiator whenever I stop after driving for a few miles? I’m thinking it’s either a hose or the thermastat but I’m not sure..any suggestions?

    1. Tyler,

      Thanks for your question about your Jeep. It sounds like you’ve got a coolant leak that only opens up once your system is under pressure. The problem could be that your thermostat isn’t open which would cause the overheating and the high system pressure which would cause the steam as well. We would recommend starting by changing your thermostat and moving on from there.

      Thanks again for your question!
      -BD Auto Pro

  34. I have a leak in my heater core where there is antifreeze coming in the car. will this product work to stop the leak? Do you guys have a guarantee for this?

    1. Joshua-

      The best product to use to stop your heater core leak is BlueDevil Head Gasket Sealer. The product carries a 100% money back guarantee and carries a success rate of over 90%.

      Feel free to contact our tech support team at 888-863-0426 with any questions.

      Thank you!

      -BDP

  35. I have a leak but i cant locate it coolant is leaking only when car is running after it heats up it smokes a little but no overheating when i look for the leak the smoke is coming from near the water pump

  36. I have a 2004 Impala with a coolant leak.
    the leak is not in the radiator or the hoses that connect to it. Not in the heater core ,(not wet inside) nor the thermostat . Water pump is working fine but I can not see it well enough to see if it leaks.I would like to try anti leak additive if you would advise that. If so, what should I use? Thanking you in advance. p.s. I can see two freeze plugs and they are not leaking

    1. Billy-

      Thank you for asking about your Chevy Impala. Based on your description, we would recommend using the BlueDevil Head Gasket Sealer. The Head Gasket Sealer is intended to treat blown head gaskets, warped/cracked heads, leaking heater cores, leaking freeze plugs, as well as radiator and block leaks. As long as you are not losing water/coolant too quickly and the vehicle will maintain idle for a full 50 minutes, you would be a good candidate for the product.

      Thank you!

      -BDP

  37. I have a 1992 GMC Sierra 1500 that is leaking coolant under the truck. I look for the leak and couldnt find it. Also when checking the coolant level in the truck it is still half way full which is strange if the coolant is leaking. I did try to drive it and the car starting smoking and wouldn’t start and then 15 minutes later it started again. Not sure if it is a bad radiator or what.

    1. S. Bracy-

      Thank you for asking about your GMC Sierra 1500. Based on your description, it is hard to diagnose where the leak is coming from exactly. Is the smoke coming from out of the exhaust pipe or under the hood? Please contact our technical support team at 888-863-0426 so that we can get a better understanding of the situation and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  38. I have a 1990 Honda accord. My car is leaking anti-freeze somewhere. There is no leak on the ground. As I have to add anti-freeze my overflow resourvior keeps filling up to the top. I did have my car check and was told that some white stuff had clogged my system up. I have in the pass used stop leak for the radiator. There is not any smell from the tailpipe. Taking the radiator cap off and watching the flow of the antifreeze shows the pump is working. I had the heater coil changed about 2 years ago. I have changed the radiator cap within the last month. I changed the thermostat with the last 7 months. What could be my problem?

    1. Carol,

      Thanks for your question about your Honda Accord. You may consider starting your search by performing a cooling system flush to clean out the white stuff that may have clogged your system. Some stop leak products can leave residue which will lower the ability of your cooling system to keep your engine cool or clog small passages. A system flush should remove those deposits and get your cooling system back to normal. You can consider using BlueDevil Radiator Flush (available here: http://store.gobdp.com/radiator-flush-00204/).

      As far the coolant disappearing, if you never find evidence of a leak, it seems most likely that the leak only happens when your car is warm and the system is under pressure. If this is the case you may consider checking your radiator hoses, the radiator end tanks and the connections for your heater core. It would be best to check these things while your engine is running and warm, but be very careful not to burn yourself while inspecting for leaks if your engine is hot.

      Thanks again for your question!
      -BD Auto Pro

  39. I have a tiny leak that seeps and settles only overnight, can I pour a small amount of the 16oz where the thermostat sits instead of the radiator because the leak is coming from the side of engine between idler pulley and engine block

    1. Eli-

      The product needs to go directly into the radiator through the radiator cap. If you do not have direct access to the radiator, with the vehicle off and engine cold, you may disconnect the upper radiator hose, pour the product in through there, reconnect the hose and start the idle from that point. Please contact our technical support line at 888-863-0426 to ensure you are using the proper amount of the product.

      Thank you!

      -BDP

  40. Hello,

    About a month ago my truck(ford ranger 1998 3L 4×4) was over heating and the check engine light came on. I changed the spark plugs and wires, drained the antifreeze, replaced the thermostat and all was good for about a month or so. The other day the check engine light came on again, since I didn’t have money to fix it, I left it parked for a few days. When I started it, I drove around the block and a lot of white smoke came out of the exhaust pipe. Since then I have changed the oil, it came out milky brown. These sound like the symptoms of a head gasket problem with coolant leaking into the cylinders, but I do not know how bad it really is, should I use the head gasket sealer or save the money to replace the head gasket all together? Please Help. Thank you.

    Respectfully,

    Mike M.

    1. Mike-

      Thank you for asking about your Ford Ranger. Based on your description, we would recommend using the BlueDevil Head Gasket Sealer. As long as the vehicle can maintain idle for a full 50 minutes, without overheating or stalling out, and you are not losing more than about a quart of water/coolant during that 50 minutes, you would be a good candidate for the product.
      It sounds like the vehicle is getting combustion/exhaust gases blowing into the cooling system and creating pressure. To give yourself the best overall chance of BlueDevil Head Gasket Sealer 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 the low compression reading. If you are not sure which one that is, you may pull all of the spark plugs and 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. Be sure to follow the guidelines for the proper amount to use based on the size of your cooling system; based on the cooling capacity of your Ford Ranger you will only need 16 ounces of BlueDevil.

      Thank you!

      -BDP

  41. Would it be safe to add this sealant over the one I already added which is a different one it’s prestone but I didn’t like it, it didn’t stop the leak at all and Ive heard nothing g but good stuff about this product that’s why I’m asking?

    1. Edgardo-

      Based on your description, we recommend flushing the cooling system, with the use of a radiator flushing agent, before using the BlueDevil Head Gasket Sealer. Not knowing specifically what chemicals are being used in the other product, we would not advise mixing the two. You can use the BlueDevil Radiator Flush, found here: http://store.gobdp.com/radiator-flush-00204/ , to get the system back to a clean state. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  42. 04/96 Ford Taurus 3.0 EFI V-6 145 hp (1FAFP52U3WD22xxxx). Stepson bought the car (alone) after a drive around the block. He’s not mechanical. Once home, filled w water, checking the fluids. Leak ~ 1 Qt a minute. Once under the car, see a steady stream out of starter motor, and from a place hard to see, there appears to be a 1″ diameter shaft, perhaps between the engine & transmission??? Seems also leaking there. No water in the oil. Appears to not overheat, temperature gauge midrange or less. (No long trips to risk a severe test. Just 5 easy miles.) I am not familiar w this V6 engine/trans unit. Visibility poor. Cannot fathom the leak. Help? :>) Thanks –

    1. Bill-

      Thank you for asking about your stepson’s Ford Taurus. Although it doesn’t seem like you have any of the symptoms of a blown head gasket, it sounds like you are losing water at a rapid rate. Unfortunately, it sounds like you are losing water a little too quickly for the BlueDevil Head Gasket Sealer to be effective. At this point, you may want to have the vehicle diagnosed by a certified ASE mechanic to give yourself a better idea of where the leak is actually coming from.

      Hope this helps!

      -BDP

  43. 99 gmc sierra 5.3 . Sudden spike in temp today when stopped at light . Comes down when in motion. Replaced fan clutch immediately. Ran idle 1o min. Turned ac on started to spike. Added dexcool and equal amount of water. No smoke . No white in oil. Located leak while running on passenger side . Can’t seem to pinpoint. Water pump and thermostat replaced 3 yrs ago all hoses are intact and dry . Looks like some kind of transfer case or something. Not sure . Help

    1. Adam,

      It sounds like you’ve done almost everything we would suggesting with the overheating situation you’re describing. If your truck doesn’t have any electric fans, just the belt driven fan, and the fan and shroud are in good condition, then the only other thing we would recommend doing is performing a cooling system flush. It’s possible that debris and corrosion products have built up in your radiator or engine block reducing the cooling capacity of your cooling system. This would cause the overheating your describing as there is a large heat load on your engine at idle with the AC on. You can use BlueDevil Radiator Flush (available here: http://store.gobdp.com/radiator-flush-00204/) to flush your system and get things back to normal.

      Thanks again for your question!
      -BD Auto Pro

  44. I have a 2007 Toyota Yaris that is losing coolant at a pretty alarming rate. I can’t see exactly where it’s coming from, but I do know that it’s somewhere on the passengers side towards the front of the engine. Almost directly above the alternator. Do you have any idea what this could be? It overheated onve, but now I have to fill both the radiator and reserve before each trip to ensure it doesn’t overheat again. Also, the reserve and radiator seem to be completely empty after sitting still for a while. Thanks in advance.

    1. Nikki-

      Please contact our tech support line at 888-863-0426. We would like to speak with you so that we may get a better idea of just how quickly you are losing coolant and what your options may be for stopping the leak. We can be reach Monday – Friday, 8:00 AM – 5:00 PM EST.

      Thank you!

      -BDP

  45. I have a 2000 Ford Taurus that has coolant appearing in the passenger seat foot well. On a 200 mile trip about 1/2 the coolant overflow tank is disappearing but only a small fraction of that is showing up in the foot well. I had the engine replaced in the last 1000 miles. Any ideas?

  46. 1997 saturn sl2 past 3 days i have had problems with my coolant it started by the temp gage going into the red and then i filled it with antifreeze and i got home and my coolant cap wasnt tight enough so all the anitfreeze was out so i filled it with water and let it run to see if i could see smoke and there was nothing coming out the next day i go to work not even a mile away and it started to go into the red part so when i got home i checked the coolant gasket and it was empty so i filled it with antifreeze this time and i went for a drive around the block and it was fine but when i went for a 30 min drive it started to do it again and every one stops me to tell me that they see something dripping under my car and i havent been using the air conditioning either

  47. Can I use this these blue devil products for leaks even if I don’t have a leak in pretty sure I dont have a leak would jst like to use this product blue devil pour N go to pour in my radiator just to be more positive and secure I jst want to knw if I don’t have a leak problem will this product be bad on my car to use bc I really want to use this?

    1. Blake-

      The BlueDevil Head Gasket Sealer should not be used as a preventative measure or preventative maintenance. It is only intended for water/coolant leaks. If you are not experiencing a leak, it would not be appropriate to use the product. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

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