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2003 Pontiac Montana w/1SA Pkg 4dr Reg WB

2003 Pontiac Montana
Trim Info:
Front Wheel Drive, 4 Door Reg WB, 2WD Minivan
19 mpg city / 26 mpg hwy
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December 31, 2012, 12:33 pm


Question: wouldn't a leaking head gasket consume coolant?

our montana is having no heat problem. mechanic swears it is head gasket, but i think the water pump is the problem. they have flushed the system twice, and it acts fine for them but as soon as we let it cool off it acts up on us.

January 5, 2013, 12:08 pm

Ron W
Expert Mechanic

What kind of heat problem. Is the engine overheating? If so, I would have a second shop look at it. Typically if the head gasket is damaged, typically you either get coolant loss, of combustion gasses in the cooling system. The second would make the car run poor and may cause low compression on one or more cylinders.

A simple over heat issue should be easy enough to find. It could be a weak pump, sticky thermostat, weak fan operation, partially plugged radiator (internally or externally) or poor coolant flow.

I wouldn't jump on replacing a head gasket until some other items are tested and or replaced.

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