Is There a Blown Head Gasket Test?

blown head gasketThe symptoms for a blown head gasket can be extremely confusing to diagnose even for a seasoned mechanic.  Your head gasket is buried deep in your engine and often requires removing almost every other component in your engine bay in order to get to.  The other problem with diagnosing a blown head gasket is that many of the symptoms are shared with other cooling system problems especially if you only have a small leak in your head gasket.

For example, one of the most common symptoms exhibited with a blown head gasket is a loss of coolant without any indication of an external leak.  This mysterious loss of coolant could be because you have a head gasket leak and the coolant is drawn into your combustion chamber and pushed out of your exhaust system, or it could simply be due to a leak that only appears at high engine temperatures and high cooling system pressures so you never notice the leak while checking under the hood or see any puddles or drips.

Another possibly confusing indication that you might have a blown head gasket is if you’ve got milky colored oil, or water in your oil.  If you do have a blown head gasket coolant from your cooling system will leak into your combustion chamber and seep past your piston rings into your engine oil.  Depending on the design of your engine, it may also be possible for coolant to leak into your intake plenum due to a bad gasket or hose.

Loss of coolant and milky oil are just a few of the possible indications that you have a blown head gasket.  Other indications can include white smoke from the exhaust, bubbles in the radiator or overflow tank, overheating, engine misfires, or other problems.  All of these indications can be caused by other smaller problems as well, but if you have multiple indications it increases the possibility that you’ve got a blown head gasket.

To help in proving you have a blown head gasket, there are a few different tests you can perform.  First, you can try a pressure test of your cooling system.  If everything is working properly in your cooling system, it should be able to hold a constant pressure up to the rating of your radiator cap, usually 10 to 20 PSI.  To test your cooling system’s integrity a garage can add a pressure gauge to your cooling system, then pressurize it using compressed air.  Once the air source is removed you can watch to see if the pressure in the system holds constant or decreases over the course of a few hours.  If the pressure decreases over time, it is an indication that you have a leak somewhere.  If you cannot find the leak externally, chances are you have a head gasket leak.

You can also try performing a compression test of your engine to find a head gasket leak.  If your head gasket is blown, it will allow the compressed air in 1 or more cylinders to bleed off into the cooling system lowering the compression in that cylinder.  If you find low compression in 1 or more cylinders, it could be an indication that you’ve got a head gasket leak in that cylinder.

There are also chemical tests you can perform on your engine’s coolant to try and detect the presence of exhaust gas in your engine’s coolant that is the most definitive of all the blown head gasket testing options you have.  This test requires special equipment and chemicals so it can be an expensive or complicated test.

After you have performed these test and proven that your vehicle does indeed have a blown head gasket, use BlueDevil Head Gasket Sealer to seal the leak without the high repair bills.  BlueDevil Head Gasket Sealer is a non-particulate sealing agent that will bond to the metal in your cooling system at the leak point to permanently seal your head gasket leak.

For more information about BlueDevil Head Gasket Sealer, click on the banner below!
BlueDevil Head Gasket Sealer

You can find BlueDevil Head Gasket Sealer at any of our partnering local auto parts stores like:

  • AutoZone
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  • S&E Quick Lube Distributer
  • DYK Automotive
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  • Any Part Auto Parts
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blown_head_gasket.jpg – By Jordan_rusev – Licensed by Getty Images – Original Link

34 responses to “Is There a Blown Head Gasket Test?

  1. Best product ever fixed 04 Toyota 4 runner. Dealer wanted 3k to fix. My friend told me about this product. I’ve tried all types of leak stop products and not one worked. Now I’m a believer.

  2. Your product worked for me and your customer service is great. Been driving for 3+years since adding Blue Devil for a head gasket leak. Very happy about it. Thanks! The word is spreading that it actually works. Parts store clerk knows many success stories.

    1. Hello everyone I purchased a 1986 Toyota SR-5 4×4 pickup about 3 weeks ago for 4600.00$ I know but the truck looks awesome after only putting 350 miles on the truck I noticed a little coolant leak on top of my engine under the carb air cleaner then a day later coolant drips coming through my bash guard , I sealed up where I thought the leaks were coming from with external tube gasket it seemed to help till 2 days later a much thicker constant white smoke with a sweet smell coming from my muffler I had heard of this product from the internet so I thought to give it a shot I followed the instructions to the letter within 5 or 10 minutes the smoke faded away my engine started to sound instantly better man what a great product worth twice what I paid at 39$ thanks Blue Devil I love that stuff.

      1. Allen-

        That is excellent to hear! Once the product seals, it would be a permanent seal, so you should be good to go at this point. We appreciate your positive feedback!

        Thank you!

        -BDP

  3. I am a tried and true Blue Devil believer who sings your praises, proudly. I’ve used your head-gasket sealer in two vehicles, a ’99 Ranger at 110,000 miles and a ’99 4Runner at 160,000 miles; it worked flawlessly, both times. As a matter of fact, I’m still driving the 4Runner that ust went over 310,000 miles. A buddy of mine cautioned me not to use it…said it would ruin my engine. He’s now a Blue Devil believer and has used it in several vehicles. Did I mention he’s a mechanic? Oh, and I’m a girl. Great product. Easy to use. It really works! Thank you, so much!!

    1. Molly-

      It is great to hear of the success you have had with BlueDevil and we’re glad we made a believer out of you and your mechanic! Feel free to contact our technical support line at 888-863-0426 if you run into any questions. We appreciate your feedback!

      Thank you!

      -BDP

  4. hi my name is James Porter owner and operator of Porters Automotive located in Salem NJ
    i am interested in becoming a Blue Devil dealer can you please send us a banner for our shop and product info of all your products to
    Porters Automotive
    PO BOX 52 Salem NJ 08079

    thanks in advance for your time

    1. Kevin-

      It is not necessary to change your coolant prior to using the BlueDevil Pour-N-Go Head Gasket Sealer. However, dirty or clogged cooling systems should be chemically flushed before installing BlueDevil to ensure the system is clean and free-flowing.

      Thank you!

      -BDP

  5. Will BlueDevil clog my heater core? I have a 2003 Lincoln Navigator AWD with a separate heater core in the back. Which of your products should I use? No white smoke from the tail pipe. No foamy oil. Does not run hot. Does not misfire. Just a small leak below the exhaust manifold on the drivers side, that only leaks when the car is shut off.

  6. I have 2005 Mercedes-Benz ML350, with smoking tail pipe on start up, and steamng coolant resevoir requiring frequent top up of coolant. Problem has been diagnosed as blown head gasket….thinking of using your product. Which shoild i try?

  7. I have a 06 2.7 dodge magnum..I have recently had a water pump,radiator,cap replaced only to be told its a blown head gasket..is your product recommended for this vehicle?

  8. I have a 90 Accord. Had radiator replaced, then hose replaced and mechanical said heater hose replacement won’t do no good it will come off again. Will blue devil help?

    1. Angie-

      Thank you for asking about your Honda Accord. 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

  9. I have a 2005 Dodge Magnum it has been diagnosed with a 2 blown gaskets, before I knew about your product I used the Bars which stopped the smoking tailpipe but it still runs bad and hot! Is it to late to use your Blue Devil!? My brother’s a mechanic and he says that it can probably save it.. Thanks

    1. Heather-

      Thank you for asking about your Dodge Magnum. Are you still noticing a loss of water/coolant? If so, it would be applicable to use the BlueDevil Head Gasket Sealer (http://store.gobdp.com/head-gasket-sealer-38386/). Based on your description, you would want to flush the cooling system prior to adding BlueDevil. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  10. I have an 03 grand am v6. It’s been running hot and losing coolant somewhere but not sure where just know it’s losing ALOT! There is a milky substance on the oil cap but doesn’t look to be actually in the oil. I replaced thermostat water pump and radiator cap and also used Bars head gasket fix. Will your product fix my problem and which one do I need to purchase

    1. Stephanie-

      Thank you for asking about your Pontiac Grand Am. How quickly are you losing 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. Based on your description, you would want to flush your cooling system prior to using BlueDevil.

      Thank you!

      -BDP

  11. I have a 1988 dodge dakota. It has a blown head gasket. Do u need to flush out the engine and cooling system before applying?

    1. Kenneth-

      Thank you for asking about your Dodge Dakota. When using the BlueDevil Head Gasket Sealer (http://store.gobdp.com/head-gasket-sealer-38386/), you would be removing your thermostat and flushing the cooling system prior to use. If you are getting water/coolant into the oil, we recommend changing the oil before and after the BlueDevil process. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  12. I have noticed I have a small oil leak and then I noticed my water resivoir is leaking and I hear a swishing sound in my dashboard when starting the car, I replaced all the water hoses and it stopped for a while and is doing it again. I don’t notice milky oil. I am wondering if it’s ok to use the head gasket sealer if your not sure that’s the problem. I use blue devil everything so I purchased it and just want to make sure it won’t hurt anything if the head is not the issue!

    1. Debbra-

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

      Thank you!

      -BDP

  13. Hello,
    I have a 2000 SAAB 9-5 SE Wagon (3.0 engine). Recently I have been having bellowing white smoke coming out of the rear exhaust pipes. I have not seen any over heating as of yet. I did notice ( just recently that a milky residue under my oil cap, but nothing in oil. The coolant in the reservoir seems to have changed a slightly different color since I replaced the coolant a few days ago. I am not driving the the vehicle, I was told the head gasket needed replacing, but that is out of my price range at this time. Do you have any products that would work in my situation? Thanks in advance.

    1. Malcolm-

      Thank you for asking about your Saab 9-5 SE Wagon. Unfortunately, the white smoke bellowing from your exhaust pipes is a tell-tale sign of a blown head gasket. Based on your description, we recommend using the BlueDevil Head Gasket Sealer (http://store.gobdp.com/head-gasket-sealer-38386/). Be sure to follow the cooling system capacity table to ensure the proper amount of product is used. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  14. Yes i have a 1995 ford explore and i put a new radiator on water pump ans thermostat on and it seems when it get warm outside it wont start and when i try to start it smoke is coming from the pipes what could it be

    1. Crystal-

      Thank you for asking about your Ford Explorer. Unfortunately, it is possible you are experiencing the symptoms of a blown head gasket. 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

  15. If I have water in the oil and not coming out of the exhaust will the product get into the pan before it seals the gasket? I’m worried about spinning a bearing. The vehicle is a chevy with a duramax engine. Also this engine has two thermostats. Do you have to remove them? Thank you.

    1. Jason-

      Thank you for asking about your Chevy. How quickly are you losing water? If you are losing water at an extreme rate, unfortunately, we would not recommend using the product in that case. 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

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