Question about 2002 Pontiac Montana

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Not hot enough

There's heat,when the temp gauge climbs to the 1/2 mark at idle, but the gauge drops to the 1/4 mark when driving, and the heat temp of course drops. We had the system back flushed. I checked the vac doors and mechanics, they are working. The top and bottom radiator hoses are hot, also the hoses to heat core are hot. I released some coolant from the bleed screw, to see if there was a vapor lock. I also checked coolant / antifreeze mixture, it's at -43.

Any suggestions?

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Check the thermastat

Posted on Nov 27, 2008

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