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
  • Advance Auto Parts
  • Bennett Auto Supply
  • CarQuest Auto parts
  • NAPA Auto Parts
  • O’Reilly Auto Parts
  • Pep Boys
  • Fast Track
  • Bumper to Bumper Auto Parts Specialists
  • S&E Quick Lube Distributer
  • DYK Automotive
  • Fisher Auto Parts stores
  • Auto Plus Auto Parts stores
  • Hovis Auto & Truck Supply stores
  • Salvo Auto Parts
  • Advantage Auto Stores
  • Genuine Auto Parts stores
  • Bond Auto Parts stores
  • Tidewater Fleet Supply
  • Bumper to Bumper Auto Parts
  • Any Part Auto Parts
  • Consumer Auto Parts


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blown_head_gasket.jpg – By Jordan_rusev – Licensed by Getty Images – Original Link

20 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.

  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!


  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!


  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 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!


  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 ( 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!


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