Coolant is being forced back into the reservoir and the temperate gauge is going up and down, why?
Mar 4, 2013 at 9:15 AM
1999 Pontiac Montana Coolant Being Forced Back Into Reservoir Temperate Gauge
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That's what you pay mechanics to figure out. There could be a leaking cylinder head gasket. It could be as simple as a sticking thermostat. To identify a leaking head gasket your mechanic will draw air from the coolant reservoir 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.
Mar 4, 2013 at 3:46 PM
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