Where is My Car Coolant Going?

Leaking CoolantHopefully your car coolant is going where it should be, through your engine!  The coolant in your vehicle actually takes two different paths depending on whether or not your car is warm or cold.  Even though you probably weren’t actually asking what path the coolant takes on its normal journey, understanding that will help you understand why your vehicle is losing coolant.  Since the purpose of your engine’s cooling system is just that, to keep it cool, it actually isn’t needed for the first few minutes after you start up your engine, especially in cold weather since it is far from its normal operating temperature.  However, most vehicle’s cabin heating systems today are actually heated by the warm engine coolant which is usually desired just minutes after the engine has been started.  To accomplish both of these goals, when your vehicle is cold the water pump will pump the coolant from your engine block, where it is warmed by the combustion process, then up through your vehicles heater core which is usually under the dashboard, and in the case of some large SUVs also under the rear seats.  The heater core is just a radiator that your vehicle’s cabin fan blows air through to warm the cabin.  The coolant then returns by a hose to the engine where it can be warmed again and returned to the heater core.  Once your vehicle’s engine warms up to the operating temperature designed by the engine manufacturer there is a thermostat that will open.   The thermostat is just a valve that when open allows coolant to flow not just through the heater core, but also through the vehicles radiator.  The radiator is mounted usually at the front of the vehicle or at least somewhere it can get a large amount of outside air flowing over it.  Here most of the vehicle’s coolant is cooled back down before it can go back to the engine block to continue cooling the engine.

Coolant LeakIf you can look under the hood of your vehicle and identify the components of your cooling system it will give you a good place to start tracking down the leak that is causing your vehicle’s coolant to disappear.  The radiator is often in the front of your vehicle, but will always be behind the AC condenser and any oil coolers.  Because of this, the radiator is located closest to the engine and will have a fan attached to it or near it.  It should have a hose at the top and the bottom.  The bottom hose usually will connect to the inlet of the water pump and the top hose to an outlet either on the block or intake manifold.  The hoses that take coolant to the heater core will likely be the only coolant hoses in the engine bay and will be ½” to 1” in diameter.  They will connect to hard tubing at the fire wall and likely be close together.  One hose will be connected to the block near the water pump outlet and one will return to the block or the cylinder head likely near the rear of the engine.  Your heater core can often be very difficult to locate as it is likely deep under your dashboard covered by electronics, air ducts and maybe insulation.  The water pump is the only rotating part in your cooling system so it is driven by a pulley connected to your engine’s crankshaft by a belt.  Often times there is a diagram under your hood that will label which parts are which.  Usually, the water pump will be the largest pulley besides the crank pulley and will usually be located right above it and be the only pulley driven piece of equipment large diameter hoses going to it.  The thermostat will be located where one of the radiator hoses is connected to the engine.

While your engine is running, check all the components of your cooling system for signs of leakage.  This could in include dripping coolant, but also may include steam from hot coolant.  If it is a very slow leak you may just see an area with an excessive amount of grime or build up as the slow leak is too slow to drip but the wet area will collect dust and dirt more quickly than a dry area of your engine.

If you discover your leak is coming from the end of one of the hoses in your engine it may be time to replace the hose.  If it is swollen and appears too big for the end connection, has cracks, rips or tears it is time to replace that hose.  If you discover your leak coming from another location use BlueDevil Pour-N-Go to seal your leaks.  BlueDevil Pour-N-Go is a specially formulated to seal the leaks in your cooling system without damaging or harming any other equipment.  BlueDevil Pour-N-Go is a non-particulate sealer that reacts to the temperature differential created at the leak point.  BlueDevil Pour-N-Go is safe to circulate in your cooling system and will only activate at the leak point bonding to metal or plastic.  For V8 engines, vehicles with large cooling capacities or very fast leaks use BlueDevil Head Gasket Sealer.  BlueDevil Head Gasket Sealer is a more aggressive sealer and will require a complete cooling system flush and a removal of your thermostat.

BlueDevil Pour-N-Go Head Gasket Sealer

When you’re ready to stop losing car coolant, pick up BlueDevil Pour-N-Go here , or Head Gasket Sealer here online directly from BlueDevil.

You can also pick up any of our great BlueDevil products at your partnering local auto parts stores like:

  • NAPA
  • PepBoys
  • O’Reilly Auto parts
  • Autozone
  • Advance Auto Parts
  • Bennett Auto Supply
  • CarQuest Auto Parts
  • Prime Automotive Warehouse

Pictures courtesy of: www.autozone.com and repairpal.com

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88 responses to “Where is My Car Coolant Going?

  1. My friend has a Chrysler Pacifica. She has engine oil getting into her coolant system. And her water pump is leaking. Will your product work on her car. I’m pretty shre her head is warped, or her intake gasket is damaged.

  2. I have/ had a slow head gasket leak in my 2002 Dodge Stratus. Since I recently put in new thermostat, new water pump, water terminal, and a part called an activant I was shocked that this summer became a nightmare. I had my mechanic use the Blue Devil treatment less than 48 hours ago. I have no more savings and on social security and can’t afford a car payment. I drove it this am to a couple of necessary stops maybe going 8 miles. It was hot outside and I did not run ac. All I noticed is a drop of liquid had come out of the front left section. This was about the size of a nickel. Is that normal? Please advise as this is my last resort for my former independence and I am only 64. Thanks!

  3. My 2004 Ford Taurus is losing coolant, but there are no leaks. I don’t even see AnY drips coming from anywhere and my oil is not milky. I cannot figure this out. AnY ideas?

    1. I do not see any leak visible water leaks so where is the coolant operating to end my radiator and reserve tank. So what is my solution. Where do I put the Blue Devil oil seal

      1. Edgar-

        Please contact our technical support team at 888-863-0426 so that we can get a better understanding of your vehicle’s condition and be able to make any appropriate recommendations.

        Thank you!

        -BDP

  4. i have a 2000 malibu…i dont kniw where my coolant is going….the fan works…no leaks…on the ground…new water pump….new hoses…but my car still runs hot and the reservoir is empty all the time i need advice

    1. Camille-

      It sounds like you definitely have a leak in the cooling system, most likely from your head gasket(s). We recommend using 16 ounces of the BlueDevil Head Gasket Sealer to help stop your coolant loss and overheating.

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

      Thank You!

      -BDP

      1. I have an 06 Malibu doing the same thing. They have replaced hoses, head gaskets.. Basically the entire cooling system and I’m still losing coolant.. Would it be worth giving this a shot? I have put to much money into this car.

        1. Michelle,

          Thanks for your question about your Malibu. Mystery leaks like this can be elusive. To confirm that you have a blown head gasket you can purchase a chemical test kit from your local auto parts store to check for exhaust gases present in your coolant. You can also have a pressure test performed on your cooling system by your mechanic which would also help prove you have a blown head gasket.

          If either of these check positive we would recommend you using BlueDevil Head Gasket Sealer to seal the leak in your cooling system and get your car running back normally.

          Thanks again for your question!
          -BD Auto Pro

  5. Vinod here,
    I have Toyota Camry 1996 model, 4 cylinders, mysteriously loosing my engine coolant, I tried to see any leaking, dripping but could not see, went to my car Mechanic; he put pressure testing instruments on radiator inlet, keep almost one hour under pressure, there was no visible leak from cooling systems, coolant pump, hose, engine ! yet coolant is missing , after short drive ! Can you suggest how can I stop mysteriously loosing coolant, and getting my car overheated. Since long, I am passing this situation, l live in Chino, CA., hot enviroment all time in summer ! Please suggest me remeady .

    1. Vinod-

      Due to the fact that it is definitely losing coolant, there has to be a breach somewhere within the cooling system. We recommend using 16 ounces of the BlueDevil Head Gasket Sealer to help stop the coolant loss and get your vehicle back to running properly.

      Thank You!

      -BDP

  6. I have a 2005 chrysler pacifica i used some blue devil head gasket sealer. My hose was damaged and i lost some of the fluid. I am currently still losing water from somewhere. Do you think i should repeat the blue devil sealant or could my heater core be blocked?

    1. Mrs. Moore-

      We would like to get a little more detail as to the symptoms your Chrysler is experiencing and how long ago the BlueDevil was applied. Please contact our tech support team at 888-863-0426 (8:00 AM – 5:00 PM EST, Monday – Friday) so that we can discuss your vehicle in more detail. This will allow us to give you the best recommendation for getting the vehicle working properly again.

      Thanks!

      -BDP

  7. My truck is using excessive coolant, I can see no leaking from any of the hoses involved. The truck does not overheat(yet) but I do see a small slow leak from the inner bottom corner of the radiator. What do need to do?

  8. I have a 05 Chrysler Pacific and had a transmission flush & every since I have to put antifreeze / water in coolant container smoking under hood .please help me why I’m I running out is it the radiator ?

    1. Cecilia,

      Thanks for your question about your Pacifica. It does sound like you have a coolant leak coming from somewhere under the hood. Our experience is that if you have a problem right after having maintenance done, they are often related. If you have a proper coolant flush they would have removed the transmission lines going to your radiator so our best guess would be that you have a leak there. If this is the case, our recommendation would be to take it back to the mechanic that did the work and see if they’ll replace your radiator as a courtesy.

      Thanks again for your question!
      -BD Auto Pro

  9. My car suddenly leaked an excess amount of coolant. There was some steam but not much. I have no idea where the leak is coming from.

    1. Lucy-

      We recommend adding the proper amount of the BlueDevil Head Gasket Sealer. This product is specifically designed to stop coolant loss.

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

      Thank you!

      -BDP

  10. I own a 99dodge intrepid es. It is starting to leak antifreeze. It’s like every 2 days I got to add antifreeze. I had it check. Hoses good. Radiator good. . from the reservoir the thermostat is working.
    Any idea what’s wrong or do u recommend blue devil?
    Please help.!!!!! Antifreeze is too expensive to buy like that.
    Oh I use the 50/50 antifreeze. Is that OK or do I need to do straight antifreeze? Help asap

    1. Dexter-

      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, then you should be able to see some great results from the product.

      Thank you!

      -BDP

  11. I drive a 2005 Nissan Murano .. this vehicle has been a champ.. I havent had one bit of trouble out of it since the day i bought it , But , I am now having to add coolant once a week .. Its not leaking . and I dont have a clue where its going .. My fan runs constantly , sometimes I have heat, sometimes I dont .. usually if I get up some speed I get heat.. My temp gauge is doing back flips.. But the car NEVER over heats.. I have had a new radiator and new hoses put on the car. I have had pressure test done.. I just dont understand what is going on with it .. Do you ?

    1. Travis,

      Thanks for your question about your Murano. Usually, mystery coolant leaks with no evidence combined with erratic temperature gauge readings are a pretty good indication of a blown head gasket. If your pressure test came back normal, it seems a little less likely but it could still be a very small leak. The last thing you could try is changing your thermostat and see if that gets things back to normal, but if not, we’d recommend trying BlueDevil Pour-N-Go to see if that can seal your mystery leak and get things back to normal.

      Thanks again for your question!
      -BD Auto Pro

      1. I have an astra 1.7 cdti sri my car is losing coolant and now my car want start and also i dont know wer the coolant is going. And since my astra started losing but iv bin ading jus water . Can you tel me what the problem may be please.

        1. Muhammad,

          Thanks for your question about your Astra. If you’re loosing coolant and don’t know where it’s going it could be due to a blown head gasket as the coolant would be going into your engine. You also may simply have a slow leak, or a leak that only opens up when the system is warm so the coolant is evaporating before it leaves a drip or puddle on the ground. You could try testing your compression to see if you have a blown head gasket or adding UV dye to the coolant to help identify where the leak is. Once you’ve determined the source of the leak, you can use the appropriate BlueDevil leak stop additive to seal the leak.

          Thanks again for your question!
          -BD Auto pro

  12. My carr blows warms air and is about half way point while driving around town. But when i go 55-60 on the highway the temperature gauge sits at about a quarter and its cold outside. and since it got colder I’ve put in antifreeze in every other day it seems. Does this mean i need a thermostat?
    During the summer the temp gauge always sat at half mark.

    1. Kayla,

      Thanks for your question about your car. It does sound like you’ve got a bad thermostat that is staying open too much on the highway. It also sounds like you may have a decent leak as well since you’re adding so much antifreeze. If you haven’t had a cooling system flush recently, we would recommend performing a flush using BlueDevil Radiator Flush (available here: http://store.gobdp.com/radiator-flush-00204/) when you replace your thermostat and add new coolant to make sure everything is operating at full efficiency. Also, before you replace your radiator, we would recommend checking your cooling system for leaks and replacing any old hoses.

      Thanks again for your question!
      -BD Auto Pro

  13. i have a 2001 dodge grand caravan sport she is loosing antifreeze and i cannot find were and niether can my michanic i get about 6 miles till she is empty what can i do

    1. Ronald-

      Thank you for asking about your Dodge Grand Caravan Sport. Based on your description, unfortunately, we would not recommend using BlueDevil in this situation. It seems you may be losing coolant a little too quickly for what the product is intended for. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

    2. Hi Ronald, I have a 2001 Dodge caravan sport as well and it is doing the same thing, did you find out what was causing your issues? Thank You for any advise you may offer

  14. I am loosing coolant in my 2002 Ford Taurus 3.0 Vulcan engine. My reservoir tank was just filled about 3 weeks ago when I had my water pump replaced due to excessive coolant loss and smoking from by the water pump. Everything was fine until about 3 days ago. I do not see where any coolant is leaking. There are no spots on my garage floor but since filling my reservoir 3 weeks ago my tank has maybe an inch of coolant in it. It also started smoking really bad again by the water pump. It is white smoke and only does this when I turn my heat on. Car doesn’t overheat at all when heat is on or off. Any idea if your product would help or what my problem may be?

    1. Kayla-

      Please contact our tech support team at 888-863-0426 so that we can get more detail about your vehicle and be better able to make the best recommendation to you. Depending on the symptoms you have seen we may be able to recommend a BlueDevil Product that will remedy the problem.

      Thank you!

      -BDP

  15. I have an 2003 Ford explorer that keep loosing antifreeze with no leaks on the ground but has white smoke in front when opening the hood,

  16. hi i have a dodge neon 2005 sxt , 2.0 engine sohc that too seem to be loosing coolant misteriously. About a 1000 miles drive i add close to a half a gallon to a gallon per approx 1000 miles. I find also a smell of antifreeze i perceive slightly. The car does not overheat (stays from a quarter to less than half in the gauge all through trips and all and seems to be acting normally) so no overheat problems. Oil is normal colour , normal smell, etc. No white smoke but yet i seem to be loosing a bit of coolant like half gallon per 1000 miles. No visible leaks , where is it going??? could it be a bad cap? or is it a head gasket leak?? NOTE: i did notice that the main radiator hose was ‘inflated” loking like if it had air trapped or so, yet is not full of coolant, could it be that i need to purge it?? any advice on what to use? or what is going on? thanks

    1. Carlos,

      Thanks for your question about your Neon. If you do suspect a head gasket leak you can always check for that using a chemical test available at most auto parts stores that checks for the presence of exhaust gases in your coolant or by having a compression check done on each cylinder. For small leaks, you can also add UV dye to your coolant, drive for a few days, then park your car in a dark garage and search for traces of the UV dye in your engine bay.

      Since you mentioned you smell coolant it is possible that you have a leak in your heater core. That would allow coolant to leak into your ventilation system where it may drain out of your AC condensate drain where you most likely wouldn’t notice it.

      Thanks again for your question!
      -BD Auto Pro

  17. I have a 2003 pt cruiser I put a new water pump on and have taken the thermostat out was told don’t really need it my car does not over heat but I have to add 50/50 just about every other day any help will be great

  18. My kia sedona loosing lots of coolant, can’t find the leak anywhere, hoses looks good, I’m scare is going to the oil, how can I check

    1. Arturo-

      An easy way to check is to pull the dipstick if you notice a “milky” look to the oil then it most likely has water/antifreeze in the oil.

      Feel free to contact us at 888-863-0426 and we would be happy to assist you in diagnosing whether or not water has leaked into the oil.

      Thank you!

      -BDP

  19. I have a 98 Honda Civic losing water not overheating did a pressure test won’t hold pressure but can’t find leak plz help

    1. Todd-

      Thank you for asking about your Honda Civic. Based on your description, we recommend using the BlueDevil Head Gasket Sealer. As long as you are not losing water too quickly, you would be a good candidate for the product. Feel free to contact our technical support team at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  20. My 1999 Malibu has a slow leak directly under the reservoir. The temperature never gets past the half way mark and the heater still works, but every other day the reservoir is empty. It seams like its loosing more fluid than the amount found by the leak. Should I change the thermostat? –

    1. Jeannie,

      Thanks for your question about your 99 Malibu. Great job keeping an eye on the temperature gauge and keeping your coolant reservoir full, that will help keep your car safe while you’re figuring out this problem. The leak you’re describing does sound like a pretty fast leak, but often coolant leaks look smaller than they really are because they leak the fastest when your car is warm and driving and the coolant often evaporates before you have a chance to check for evidence of a leak.

      You may try leaving your car running next time you get home from a longer drive and check for steam or for more fluid to help you pinpoint where the leak is coming from. Just be careful not to burn yourself and to stay clear of your engine’s fans.

      The problem you’re describing doesn’t sound like a problem with your thermostat since your vehicle’s temperature remains constant and it hasn’t overheated, we would recommend tracking down the leak first as it most likely is from a small hose somewhere near your coolant reservoir.

      Thanks again for your question!
      -BD Auto Pro

  21. i have an 06 dodge grand caravan. my radiator stays empty and i don’t see a leak under the radiator. when i look the water is pouring from further back. i have to put water in it at least 3 times a day and once i put it in i watch it come out. where could the water be coming from because it leaks from right behind the motor.

    1. Faleisha-

      The amount of water/coolant that you are losing from your Dodge is more extreme than what our BlueDevil Head Gasket Sealer is intended to fix. The only way to fix a severe leak such as yours would be to replace/repair hard parts.

      Thank you!

      -BDP

  22. Hi I have a Citroen xsara Picasso my radiator is leaking from the bottom of the radiator but not sure where abouts as the water runs along the bottom of the radiator I’m constantly topping up with water any idea’s on this one thanks Sam

    1. Sam-

      Please contact us at 888-863-0426 so we can get a better idea of how quickly you are losing water/coolant? Depending on the extent of the leak we may be able to recommend one of our BlueDevil Products.

      Thank you!

      -BDP

  23. I have a 2006 Malibu Maxx. Yesterday morning my low coolant light came on during my 45 min drive to work and later my lunch break was cut short as the gauge shot up to “HOT” and lights were blinking all over the place. Just had my oil changed and fluids topped off a month ago, and when i looked under the hood my antifreeze was gone, but i could not locate where it had gone to. Nothing dripping under the hood or under the car itself. I filled it back up with antifreeze and was able to drive about an hour or so last night, and this morning the gauge was creeping towards HOT after about 5 mins of driving, and my reservoir tank was almost empty already, had to fill it with another bottle of antifreeze. i don’t see leaks anywhere, but certainly could be happening when i’m driving and i don’t notice it.

    1. Tricia,

      Thanks for your question about your 2006 Chevy Malibu. Coolant leaks can be difficult to find because they are steam while your car is running. Based on how quickly you say your car is loosing coolant, it sounds like your leak is pretty large. Try checking for some other signs of a blown head gasket like milky colored oil, smoke from your trail pipe or bubbles in your radiator.

      To quickly find your leak, you can try adding UV dye to your coolant, then checking your car over at night with a black light to see where the leak is. You can find UV dye at most auto parts stores. When you find your leak, you can use the appropriate BlueDevil stop leak agent available here: http://store.gobdp.com/products/.

      Thanks again for your question!
      -BD Auto Pro

  24. I have a 91′ Toyota Land Cruiser inline 6 4.0, about every month I’ll need to add about a half gallon of antifreeze to the radiator, but I can’t find where the leak is going. The oil is clear and definitely has been chemically tested and was told there were no chemicals of antifreeze in the oil, I have checked to see if the overflow container leaks, and everything else. No go, I installed a new thermostat myself, and gasket, but can’t find a leak anywhere. I checked all obvious places but under the block is bone dry. New radiator as well, it has got me wondering, is it possible the cooling system is leaking into the exhaust system and burning there? I haven’t seen any white smoke from the exhaust..could your product patch whatever leak I have going on?

    1. Braxton-

      Thank you for asking about your Toyota Land Cruiser. Although it does not seem you have any of the tell-tale signs of a blown head gasket, that fact that you are losing coolant would make you a good candidate for the BlueDevil Head Gasket Sealer. It’s possible that you are only losing coolant while the vehicle is in motion, explaining why you are not really seeing a leak. If water/coolant was leaking into the exhaust system, you would see white smoke coming from the exhaust pipe. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  25. Hi I have 2005 hyundai elantra and i have been having cooling system problems i changed the radiator and i was wondering when you add coolant into the radiator does the level stay the same or as you drive does it lower ( flow through)

    1. Jordan-

      The coolant level should not drop unless you have a leak somewhere in your cooling system. If the level is dropping over time then we recommend contact us at 888-863-0426 so that we may discuss our products and assist you in getting the best one for stopping the leak.

      Thank you!

      -BDP

  26. I keep having to put coolant in the container which is next to my power steering container. I check the radiator and its full. I have a 1993 toyota camry.

    1. Vanessa-

      Thank you for asking about your Toyota Camry. 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

  27. hi, i have toyota yaris sedan 2012 from saudi arabia. I mistakenly drained the radiator coolant and drive it for around 20 kilometers. While driving, i heard a little noise when pressing the pedal which sounds like metal to metal and the overheat warning light is on. I keep on driving and the car stopped. I started it again and drive another 5 kilomoters and the car stopped again. It was just the moment that i realized that i drained the radiator and when i check it, it was smoking upon opening the cap. After that, i fill the radiator full with coolant and i thought my problem was resolved. After 2 weeks of using my car again, the overheat sign was back. And upon observation, i was losing around 1 liter of coolant every time i drive 40-50 kilomters. Upon checking, there is no leak in the hose or everywhere. My question is, where the coolant is going? Thanks for d help

    1. Nico-

      Thank you for asking about your Toyota Yaris. From the sounds of it, when the vehicle was driven without water/coolant in the system, it overheated and unfortunately, may have blown the head gasket. Water/coolant getting in the oil or smoke coming from the exhaust pipe would be tell-tale signs of a blown head gasket, so it would be a good idea to start your search there. Another possibility could be that the water/coolant is getting back into your cylinder heads. If you are experiencing a rough idle or getting a misfire reading or code, that may be an indication as to where the coolant is going.
      As long as you are not losing water/coolant too quickly, and the vehicle can idle for a full 50 minutes without overheating or stalling out, you would be a good candidate for the BlueDevil Head Gasket Sealer, found here on our website: http://store.gobdp.com/head-gasket-sealer-38386/ . Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  28. Hello I have a Chrysler Pacifica Everytime I pour antifreeze or water in it disappears and now im starting to see a slow water leak underneath the engine some where on the passenger side so I don’t know if it’s a hose or something else because you can’t see any bottom hoses so I was wanting to know would the blue devil product work if so which one I believe I have a v6 engine and it’s a 06 Pacifica . Thanks

  29. I have a 05 3.8L chysler Pacifica I keep losing my coolant I seem to have a water leak in the front of my radiater it continues to leak water, coolant what ever I put in it I called chysler they do not make that part I’m stuck what can I do

    1. Cindy-

      Thank you for asking about your Chrysler Pacifica. Based on your description, we recommend using the BlueDevil Radiator & Block Sealer, found here on our website: http://store.gobdp.com/radiator-block-sealer-00205/. As long as you are not losing more than about a quart of water/coolant during the 45 minute idle, you would be a great candidate for the product. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  30. I have a new 2014 Chevy Cruze 1.4l, I’ve noticed that over time it has slowly been losing coolant but I don’t see a leak anywhere, the leak is very slow. What should I do?

    1. John,

      Since your car is so new, you may consider taking it to a dealership to see if it is still under warranty. It’s not usual to slowly lose coolant due to evaporation in some vehicles so this may be what’s happening in your car. For very slow leaks like this, you may consider adding some UV dye to your coolant. After a few days of driving, you can park you car in a dark place and use a black light to look for traces of the dye around your cooling hoses, gaskets, block and radiator.

      Thanks again for your question!
      -BD Auto Pro

  31. I have a 2002 Toyota Camry 4 cylinder engine. I recently started to loose coolant, however there is no visible leaks and signs that the coolant is being burned off through the tailpipe. The car has not overheated.

  32. i recently flushed my coolant and replaced it with coolant and distilled water but it didn’t take the amount it supposed to hold. It supposed to hold about 20 quarts which is roughly close to five gallons and it only took a little less than three gallons total (coolant/water) My truck is a F-150 2006, v8 4.6l

    1. Ethan-

      Are you noticing a loss of water/coolant? 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

  33. I have a Volvo 850 1995 that I had sit for 3 weeks while I was on vacation before I left the thermostat had broke and was over heating until I pulled it out and now that I’m back the water reservoir is is empty everyday and I fill it up before I go but i don’t know where the water is going. There are no visible leaks.

    1. Eyver,

      Thanks for your question about your Volvo. Based on your question you could have quite a few different things going on. Our best guess is that you’ve got a coolant leak that only shows up once your system is hot and pressurized. Coolant that leaks while hot easily evaporates and can leave almost no trace of the leak.

      One thing we would recommend doing is adding UV dye to your engine coolant and driving for a few days. After a few days of driving, park your car in a dark garage and use a UV flashlight to search for evidence of your coolant leak around your engine bay and under your engine.

      Thanks again for your question!
      -BD Auto Pro

  34. I noticed my coolent from my reserve is disappearing constantly leaving me to fill it up. I just flushed my radiator added to new hoses and changed the thermostat. The results are still the same with mulk now on my radiator cap. I also noticed a smell of gas, could be a blown casket or engine has rust and probably needs to be replaced. What you guys think? My engine is a 5.0 1994 chevrolet silverado 1500 with over 10010 miles. should I drop a new engine in or fix the problem?

    1. Frankie-

      Thank you for asking about your Chevrolet Silverado. 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 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; you will need the full 32 ounce bottle for your Silverado.

      Thank you!

      -BDP

  35. I have a 2004 Jeep Grand Cherokee. I am making payments on this car. I have had it maybe six months. I tried my heater and it hardly works. It will work then after awhile it will blow cold air. As I am driving I am hearing this knocking sound under my dash board. I noticed two weeks ago my Gauge was on and my thermostat stated 260. I was out of water. I haven’t put any water/cooliant in it since three months. It has always been full. Then two weeks later I noticed again, empty! I put more water in it. I did fill it up so when I cut off the car it made this gurgling sound! No leaks! I did have someone tell me it looked like some drops over my engine but, I am not certain. What can this be?

    1. Amy-

      Thank you for asking about your Jeep Grand Cherokee. It is possible that you are getting combustion/exhaust gases pumping back into the cooling system.  You can use a “Block Dye Tester” to confirm whether or not that is the case. BlueDevil Head Gasket Sealer will still work if your vehicle is 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 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.

      Thank you!

      -BDP

  36. Hi!my name is Luciano , the antifreeze is going into the engine of my ram 3500, and the engine and radiater is cold after driving 3 hours, I can even open the radiater cap wit truck running and there is no pressure and coolant is cool,can u let me know what’s happening ? Thank you

    1. Luciano-

      Thank you for asking about your Dodge Ram 3500. 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

    1. Kate-

      The BlueDevil Head Gasket Sealer would be added directly into the radiator through the radiator cap. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  37. Hi,

    I bought Nissan Pulsar N16 2005 car recently and noticed that there is water reduction in the reservoir tank. I removed the thermostat as well now it circulates all the time. I can see rust in the radiator.

    1. After running for 10-15 min I can see bubbles in the reservoir tank.
    2. After driving for more than one hour the water overflows in the reservoir tank and the system starts to overheat (sudden rise in the heater gauge)
    3. No engine miss at all, no oil in the radiator, no water in the oil tank.
    4. Pressure test in the radiator slight pressure loss after 15 min. But no visible coolent loss. Water level reduces by 50-100 ml.
    5. Cylinder Compression test all 4 cylinders around 110.

    Can this be a fault if radiator, water pump, head gasket or anything else ?

    Highly appreciate your advice.

    Thanks in advance.

    1. Dan-

      Thank you for asking about your Nissan Pulsar. Based on your description, it sounds like you may be experiencing a head gasket leak. You can use a “block-dye test” to confirm whether combustion/exhaust gases are getting into the cooling system. If the “block-dye test” does not show combustion/exhaust gases as being present, we recommend looking into having the water pump replaced. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  38. I have a 2004 Grand Marquis Designers Edition it’s loosing engine coolant don’t know where or how but just keep refilling it & just recent it starts smoking like at least about 10-15 mins of running (White Smoke) … the longer it runs the more smoke ….. Do you have an ideal what’s causing this?

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