How do you "check" a thermostat? The most common cause is a leaking cylinder head gasket. Any mechanic seeing bubbles in the reservoir is going to recommend a chemical test at the radiator to test for that. That involves drawing air from the radiator, while the engine is running, through a glass cylinder with two chambers partially-filled with a special dark blue liquid. If combustion gases are present, the liquid will turn bright yellow.
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Saturday, February 22nd, 2014 AT 9:25 PM