Question about 2002 Pontiac Montana
Have you tried checking the coolant lines going into your heater core to see if there restricted, it could also be a bad water pump, or a worn or loose drive belt. It sounds like you have poor coolant flow goiing through your system. You might want to also check your coolant reservoir cap to see if it is maintaining the proper pressure. Good luck.
Posted on Mar 12, 2009
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Posted on Jan 02, 2017
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