![]() If your engine overheats it can cause lots of problems. This happens both due to the lack of coolant as your engine consumes it, but also the efficient combustion process, the excess heat from the exhaust in the coolant and the inability of your vehicle’s radiator to cool the dirty coolant. If you’ve got a blown head gasket, your engine usually will overheat after longer drives. This is the most effective blown head gasket test and can give you a positive sign of a blown head gasket. An easy do-it-yourself test for a blown head gasket is to perform a chemical test using this type of tester on your coolant to check for the presence of exhaust gases to see if this is happening in your car. The bubbles are exhaust gases that force their way into the cooling system during the combustion process. This can cause bubbles to be in the radiator or coolant reservoir making the coolant look like it’s boiling even when it’s cold. Bubbles in the Radiatorīesides allowing coolant into the combustion chamber, an internal head gasket leak allows exhaust gases into the coolant. ![]() If the leak in the head gasket is large this white smoke can often be excessive and billow from the tailpipe. This smoke can be differentiated from moisture during a cold start by a sweet smell and will continue even when the engine is warm. When this happens to coolant burns/evaporates with the combustion process and appears as white smoke coming from the tailpipe. Most head gasket leaks are internal to the engine allowing coolant to flow into the combustion chamber on every intake stroke. If there are no other cooling passages or hoses near the head gasket you may be able to positively identify the leak as a head gasket leak, but if there are other cooling passages nearby, you may need to add a UV dye to the coolant then watch the head gaskets with a UV light to positively identify the leak. Bubbles in the radiator or coolant overflow tankĪ head gasket leaking external would cause coolant to come from below the intake or exhaust manifold and often only happens when the engine is completely warmed up. ![]()
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