1999 Pontiac Montana Repair Question
Topics covered: Gas, Coolant, Head gasket.
Mileage: 190,000 miles.
Mileage: 190,000 miles.
Asked on March 4, 2013
Pontiac Montana Gas Problem
Coolant is being forced back into the reservoir and the temperate gauge is going up and down, why?
Asked by (pending member)Answer
Replied on March 4, 2013
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.