How Do I Know If A Head Gasket Is Blown. There are a few ways to tell if your cylinder head gasket has blown: From a purely visual perspective, the most surefire evidence of a blown head gasket is the presence of leaked coolant along the gasket surface.
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White smoke from the exhaust pipe. One of the clearest signs of head gasket failure is the milky sludge on the underside of the oil filler cap or the dipstick, sometimes jokingly called a milkshake or mayonnaise. External leaks of coolant from under the exhaust gasket.
Depending on the severity of the leak, you may see bubbles in the overflow tank, indicating that the cylinder is leaking into the cooling system. To see if your radiator is bubbling, wait for your car’s engine to completely cool off — usually about two hours after driving — and carefully remove the radiator cap with a rag or towel. Your car’s engine operates in extreme conditions with intense heat.
One sign of a blown head gasket is bubbles in the radiator. Since the head gasket is meant to prevent the mixture of these fluids, a blown head gasket could cause this and the results can be catastrophic. The extra heat results in the cylinder head and engine block expanding too much which results in a failure in the head gasket.
When you have a good understanding of how your car handles cooling, then the two things certainly make a lot of sense together. How to tell if you have a blown head gasket. You may notice a few or all of the following:
Coolant leaking externally from below the exhaust manifold. An external oil or coolant leak at the seam between the engine block and cylinder head is a sign that the head gasket has failed or the cylinder head has cracked. If the gasket blows, all fluids may enter into or out of the combustion chamber.