How Can I Check For A Blown Head Gasket?

Blown Head GasketThe best way to check for a blown head gasket is to know the symptoms it creates in your vehicle.  Many of the symptoms a leaking head gasket creates can be confused with other problems, so it’s important to diagnose the problem correctly and look for multiple symptoms.

Symptoms of a Blown Head Gasket:

  • Over heating
  • Low Coolant levels
  • Coolant leaking from the engine
  • White smoke from the exhaust
  • Sweet smell while driving

There are varied and multiple symptoms of a blow head gasket because the head gasket has a lot of jobs.  The head gasket sits between the engine block and the engine head.  Coolant has to flow in and around the head and the block and it is kept in the coolant passage by the head gasket.  Also, the head gasket is responsible for keeping the combustion gases in the combustion chamber and out of the coolant passages.  Head gasket failure can therefore result in a leaking of coolant outside the engine to the atmosphere, and leaving drips or puddles under your car, or leaking of coolant into the combustion chamber causing white smoke from the exhaust and a sweet smell.

Having multiple of the above symptoms at once is a good indication that you have a blown head gasket, however you can check for sure.  If you have an external leak with puddles and drips, you can check to see if the coolant is coming from in between the head and the block (just under the exhaust manifold).  You may need a mechanics mirror, available at your local auto parts store, to be able to see the affected area.  If you Blown Head Gaskethave an internal leak with white smoke and a sweet smell, you can purchase a Combustion Leak Test Kit from your local parts store.  The Combustion Leak Test Kit will test your coolant for the presence of exhaust gases, proving there is a breach between your combustion chamber and coolant passages.  Lastly, you can perform a cooling system pressure test to detect a leak, but the equipment for this test is expensive and it will only prove there is a leak, and not necessarily the location.

Once you are confident your head gasket is leaking, head to your local AutoZone, NAPA, Advance Auto Parts, Car Quest, O’Reilly, or Bennett auto supply or Prime Automotive to pick up a bottle of BlueDevil Head Gasket Sealer or Pour-N-Go.  BlueDevil Head Gasket Sealer is activated by the temperature differential at the leak point so it only is activated where there is a leak and will not clog or harm the rest of your cooling system.  You can also purchase BlueDevil Head Gasket Sealer directly from BlueDevil here: Head Gasket Sealer

BlueDevil Head Gasket Sealer

Pictures provided by www.aa1car.com and www.inlinegarageservices.co.uk

 

8 responses to “How Can I Check For A Blown Head Gasket?

  1. So I bought blue devil and without opening it, overnight 75% of it evaporated or spilled. I guess the seal was broken. Its cool that they are sold with broken seals and you pay 50 bucks to not even be able to see if it works.

  2. Have a 4.3 liter, inboard/outboard, GMC motor.
    The coolant is not in a closed system, but circulates H2O surrounding boat as a coolant. Will BlueDevil head gasket sealer work on this motor?

    1. Nick-

      We have had success using BlueDevil Head Gasket Sealer with marine applications in the past. The key is that you are able to circulate the same body of water for the recommended 50 minute idle; using a bucket or barrel would accomplish this. The other need is that the water will heat to at least 150 degrees during that run.

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

      Thank you!

      -BDP

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