Do you see that bubbling right after starting the engine when it's still cold? If so, you know it's not overheating yet. That's a sign of a leaking head gasket. When combustion gases leak into the cooling system, that air can pool under the thermostat and prevent it from opening. They open in response to hot liquid, not hot air.
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Sunday, October 21st, 2012 AT 2:06 AM