Why is There Coolant Leaking into My Car?

I don’t know if you’ve ever had the opportunity to own a car that was old enough or cheap enough that you had trouble with it leaking into the passenger compartment, but I have.  I’ve actually had a few different cars that would get your wet feet if you jumped in after a rain storm.  There are quite a few seals and openings into the cabin of your vehicle so finding out where the water is coming from can often be a difficult job.

Coolant Leak

You can try checking the seals on your doors, especially if you have free standing windows like some Subarus and sports cars have.  Make sure the window is rolling up all the way and the seal is well seated in the jamb.  You can also check sunroofs and even your windshield seal.  Most leaks into the cabin come through your ventilation system.  Most cars gather air at the base of the windshield under the back of the hood and draw it from there through the blower fan.  Unfortunately this is also a place water likes to collect.  Most vehicle ventilation systems have a drain to let the water out of the ventilation box while keeping the air flowing through the blower.  Check to see if that drain is disconnected or clogged.

The last thing you can check is to see if it really is water, or if it is an antifreeze leak coming into your car.  Antifreeze runs through your heater core which usually sits somewhere behind or under your dashboard, many times on the passenger side.  Heater cores are relatively fragile and it’s not unusual for them to acquire small leaks over time.  To check if you have an antifreeze leak and not water, dab some up with a white cloth.  If it is green, smells sweet or has a slimy feel it’s probably antifreeze.

Some other possible indications you need to stop a leak in the heater core:

  • vapor coming from your vents
  • a haze or fog on the inside of your windshield
  • a sweet small Inside the car
  • low coolant light

Leaking Heater CoreDue to the location of the heater core, most of the time they are extremely difficult to replace, even though it is a relatively inexpensive part.  Due to the difficulty of replacement, repair costs can be high because of the long labor times that are charged.  Often times, heat cores can even be difficult for a home mechanic to replace as well due to the number of electrical components that need to be removed and wires that will be left to get forgotten or crossed upon re-installation.

 

The best solution for fixing a leaking heater core is to seal it from the inside out.  This process does not require removal of any components, nor does it pose any risk to the rest of your cooling system.  BlueDevil Pour-N-Go is the best sealing agent for stopping a leak in your heater core.  When your car is cool, add BlueDevil Pour-N-Go directly to your radiator for best results.  Next time you drive your car, Pour-N-Go will be circulated through your cooling system by your vehicles water pump.  Once your car is warmed up, there will be a temperature differential at the leak point in your heater core.  This temperature differential will activate the chemicals in Pour-N-Go causing a permanent chemical weld at the leak point.  BlueDevil Pour-N-Go is suitable for heater cores made of all types of material.

BlueDevil Pour-N-Go Head Gasket Sealer

Make your repairs simple and purchase BlueDevil Pour-N-Go at our partnering retailers:

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

You can also purchase Pour-N-Go directly from BlueDevil online here: Pour N Go Head Gasket Sealer

Pictures provided by www.benzworld.org and vintagemotorsusa.org

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34 responses to “Why is There Coolant Leaking into My Car?

  1. Dear Sr. I had a head gasket leak 2 weeks ago I used the pour-n-go HGS and it work, now I have discover that the car had a bypass on the heater core (Heater Radiator) . Please tell me if the existent HGS in the system can still seal the unknown suspected leak in the core. How long the pour-n-go maintain its effectivity?
    I will appreciate your prompt answer before i replace the faulty unit. Thank you.

    1. The BlueDevil “Pour N Go” only reacts to heat one time. Due to the fact that you are experiencing symptoms of a new head gasket leak you would need to reapply the product to stop the leak.

      Feel free to contact us at 888.863.0426 with any questions.

    2. My auto is leaking coolant and I don’t know what is causing this. It’s not leaking inside of the auto.but I do hear the water behind the dash. What do I do. ?

      1. Howard-

        Based on your description, we would recommend using the BlueDevil Head Gasket Sealer. As long as you are not losing water/coolant too quickly and the vehicle will maintain idle for a full 50 minutes, without overheating or stalling out, 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

  2. I have a leak in my heater core. I used pour n go and had my car running for an hour with the heater on full blast. Once I tuned my car off I noticed that the passenger side had coolant all over the floor matt and drenched my carpet. Seemed to be dripping from the glove compartment. Why did this happen? Did the car just drain the liquid? Should I try another bottle? I still hear a leak coming from the vents, however no smoke or overheating. Please help!

    1. Ashley-

      Unfortunately, it seems you may be losing coolant a little to quickly in order for the product to be able to work properly. Please contact our technical support team at 888-863-0426 so that we can assist you with the warranty information.

      Thank you!

      -BDP

  3. Hi I have a grand pri 2008 about 2 weeks ago i noticed something was on the floor of my car on the passenger side I thought someone dropped juice or something so i ignored it however days later i noticed my feet were all wet & so was my purse n i was like what the hell is dripping here? We kept using the car n the other day i literally saw when the liquid was dripping on my foot so i googled it & i found out its the heater core. I dnt have money to buy a new one at this time so i figured i should buy the Blue Devil product but I think its dripping way too fast so will this help? Or should i just do a bypass I need my car asap so please answer

    1. Diana-

      Thank you for asking about your Pontiac Grand Prix. As long as the vehicle can 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. If you are losing water/coolant a little quicker than that, unfortunately, a hard part repair may be your best option.

      Thank you!

      -BDP

  4. I have a 2007 Buick lacrosse CX an it is leaking antifreeze in to the passenger side of my car. It haven’t over heated at all I want to know what can I do to fix it…

      1. Im just seeing this post I hope it’s not to late cause now its also leaking from under my.It still haven’t over heated I just put more antifreeze it I need it.can it still be helped

        1. Lakeisha-

          As long as it is not losing more than about 1 quart of antifreeze during a hour run then there is a very good chance that BlueDevil Head Gasket Sealer will be able to seal it.

          Thank you!

          -BDP

  5. I’ve noticed coolant in my passenger side do I use the head gasket sealant or what nothing is dripping on my feet or overheated I’m a single mom of three need something cheap to fix it

    1. Misty-

      Based on your description, we would recommend using the BlueDevil Head Gasket Sealer. As long as you are not losing coolant too quickly, you would be a good candidate for the product. Be sure to follow the cooling system capacity table on the back of the bottle to ensure you use the proper amount of the product. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  6. Hi i have a 1986 nissan maxima at first i could hear hissing and I thought my radio was acting weird but then 7 minutes passed and coolant smoke was coming through my vents while I was driving then another 15 minutes pass and my whole car was filled with white smoke and some coolant was leaking from the bottom of my car.

    1. Phillip,

      Thanks for your question about your Nissan Maxima. It sounds like you’ve got a leak in your heater core. The hissing and smoke would be coming from high pressure and temperature coolant leaking through the heater core into your ventilation system. As the leak got bigger, the coolant would condense and either leak onto your floorboards or out through the condensate drain for your HVAC system. You can use BlueDevil Pour-N-Go Head Gasket Sealer (available here: http://store.gobdp.com/pour-n-go-head-gasket-sealer-00209/) to seal to leak and get your car back to normal.

      Thanks again for your question!
      -BD Auto Pro

  7. I HAVE A 2005 PONTIAC G6
    AND ANTI FREEZE IS LEAKING INSIDE MY CAR ON THE PASSENGER FLOOR.. BUT MY CAR IS NOT OVER HEATING
    WILL THIS SEALER WORK FOR ME

    1. Brittany-

      Thank you for asking about your Pontiac G6. Based on your description, we would recommend using the BlueDevil Head Gasket Sealer to seal your antifreeze leak. Be sure to follow the capacity table on the back of the bottle for the proper amount of product to add. You would need about 16 oz. of the product for your vehicle.

      Thank you!

      -BDP

  8. I have a Mazda rx8 2004 I notice a coolant in my passenger sit to day when I drive the car the fog comes from comes from the vents the car didn’t over heat so i dont know if the car it’s candidate to do

  9. I have antifreeze in my passenger side floor also. My heater nor air conditioner work either and if my car sits and idles it over heats? Would this product work for me?

    1. Monica-

      In order to get the benefit of using the BlueDevil Head Gasket Sealer, the vehicle would need to be able to idle for a full 50 minutes without overheating or stalling out, and you shouldn’t be losing more than about a quart of water/coolant during that 50 minutes. If the vehicle can meet those basic guidelines, it 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

  10. Hey guys….I have a 2006 Ford Taurus and I have leakage into my passenger side cabin floor. The car rides rough when I turn on the heater/defrost, there is an odor, and light smoking from under the hood down around the manifold. I personally changed out the heater core (8 hrs ? thank goodness for YouTube lol) Thought the issue was fixed but the conditions are still occurring. I think I have an oil pan gasket leak as well.

    Based on this info, 1) what’s your professional opinion on what could be wrong? and 2) would Blue Devil HGS be useful?

    Thanks in advance guys.

    1. Willis-

      Thank you for asking about your Ford Taurus. Based on your description, if the same symptoms are still present, it sounds like you may still have a heater core leak. The BlueDevil Head Gasket Sealer would be able to seal a leaking heater core. As long as the vehicle can maintain idle for a full 50 minutes, without overheating or stalling out, you would be a great candidate for the product.

      Thank you!

      -BDP

  11. I have a pontic grand am 2008 I saw my coolent light was on so I add coolent to my car, that was at 2:30pm at 12:am I saw that the coolent was leaking into my car I can not tell where the coolent is leaking from all I know is that my whole passengers side floor is soak. Can your product fix this issue???

    1. Tammy-

      Thank you for asking about your Pontiac Grand Am. Based on your description, you may be experiencing a heater core leak. We recommend using the BlueDevil Head Gasket Sealer for your heater core. As long as the vehicle will maintain idle for a full 50 minutes, and you are not losing more than about a quart of water/coolant during that 50 minutes, you would be a great candidate for the product.

      Thank you!

      -BDP

  12. My car is quickly leaking antifreeze on the ground and in the car on the drivers side and it overheats quickly. I also noticed a grey fog coming from my cars vents too. If I get the Blue devil pour-n-go will that solve my problem? Do I jist let the car run while its in there or can I drive around?

    1. Kymbriel-

      Unfortunately, you may be losing antifreeze a little too quickly for the product to be successful. In order to get the benefit of using it, the vehicle would need to be able to idle for a full 50 minutes, without overheating or stalling out, and you shouldn’t be losing more than about a quart of water/coolant during that 50 minutes. A hard part repair may be your best option.

      Thank you!

      -BDP

  13. I have Ford Figo 2012 model , My antifreeze leaked with High Pressure for a 30 second and stopped , then have little hissing sound in my AC Out. But I dont have leaking Problem now , How to i Fix , will it come back again , This Bcz of overheating ? or Problem in Com presser ?

    1. GK-

      Thank you for asking about your Ford Figo. Are you noticing a loss of antifreeze or refrigerant? If you are losing antifreeze, that would not be producing a hissing sound from the A/C, so the two issues would not be related. 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. John-

      Thank you for asking about your VW Golf. Based on your description, it seems you may be experiencing a heater core leak. We recommend using the BlueDevil Pour-N-Go Head Gasket Sealer. As long as you are not losing coolant too quickly, and the vehicle will maintain idle for a full 50 minutes, you would be a great candidate for the product.

      Thank you!

      -BDP

  14. I have a ’04 Volvo S40. It is leaking coolant into the passenger side. I fill up the coolant tank and it almost immediately drains, but not onto the ground. I eventually see it all build up into the passenger side.

    1. Sadie-

      Thank you for asking about your Volvo S40. Based on your description, it is possible you are experiencing a heater core leak. We recommend using the BlueDevil Head Gasket Sealer (http://store.gobdp.com/head-gasket-sealer-38386/) for your heater core leak. Be sure to follow the cooling system capacity table on the back of the bottle to ensure the proper amount of product is used.

      Thank you!

      -BDP

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