If you pressurize the cooling system and have a leak, coolant will slowly make its way into the combustion chamber. You will need a pressure test kit and time to let things sit. The last test you can perform is a cooling system pressure test. Also, if you choose to do this test hot, be EXTREMELY CAREFUL to not burn yourself or damage your tools. Make sure to leave pressure on the cylinder for a few minutes while watching for bubbles to test for the smallest leaks. The only way for air to travel from the cylinder to your radiator is if you have a blown head gasket. Next, watch the radiator for air bubbles in the coolant. Next set the piston you’re testing to bottom dead enter and add air pressure up to 100 psi slowly to the cylinder. You will first need the proper fittings to attach an air compressor to your spark plug threads. You can attempt this test with the engine cold which is much safer, but if the leak is small it won’t show up without when the engine is cold. As the name suggests, this test is best done when the engine is hot. The next definitive test you can do is a hot block pressure test. The only way exhaust gases could get in your cooling system is if you have a blown head gasket. Then use the test kit to test for the presence of exhaust gas in your cooling system. Then drain enough coolant from your cooling system so you can idle your car with the radiator cap off and coolant doesn’t boil out. First, purchase or rent a chemical test kit from your local auto parts store. The first definitive test you can do is a cooling system chemical check. Here are the tests available to you: How to Test for a Blown Head Gasket All of these tests if they come up negative will still leave you questioning, but if they turn up positive then you are guaranteed to have a blown head gasket. This article will be dedicated to the no question TESTS that can be done to for sure prove you have a blown head gasket. At the end of the day, all of these symptoms could be happening together and, even though the chance is small, you may still not have a blown head gasket. There are a few different ways to test for a blown head gasket, but the easiest of them all is to check for multiple symptoms of a blown head gasket all happening at once.
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