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Re: Montana thermostat
Unfortunately, mine turned out to be a blown head gasket. The 2002 3.4L Chevy/Pontiac engine has a rubber/plastic composite gasket that leaks. What you’re experiencing most likely is an air pocket that is trapped in the system which can move around. The local dealership wants +/- $1000.00 to replace the head gasket, but I know the dealership shop foreman. He said he would do it for $400.00. I wound up trading it off for a new Durango, it needed tires, shocks and other stuff.
Check your radiator. If there is coolant caked up on and near the cap, there is an air leak in the system. When air hits that red-100,000 miles coolant, it turns to mud and consequently stops up your water pump. If you have mud in you radiator, you definitely have a gasket leak. Good luck.
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