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the only true way to stop a leaking head gasket is to replace it.

AnswerI couldn't agree more. Coolant sealer doesn't know the difference between internal passages and exterior leaks. Answer

It works for some people. If your car's not worth the actual repair, which can be hundreds or thousands of dollars, it's worth a try. Coolant sealer tells the difference between internal passages and leaks by the much higher temperature of the engine.

AnswerFrom my experience, while it may stop the headgasket leak for a while, it may also restrict the radiator, heater core, and internal engine passages.
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14y ago

What else can I help you with?