Question about 2001 Pontiac Montana

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2000 Montana heater problems. Only get very little heat in warmer weather. Temp guage doesn't always move. A/C and air flow are both fine. What could this be?

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Your thermostat may be stuck open. Your cooling system could be low on coolant, but if that was the case your temp gauage should still move.
Would probably start with a thermostat-you may even have trouble code stored for the thermostat(P0128).

Posted on Oct 03, 2009

Testimonial: "I also had a flush done because they kept saying it wasn't the thermostat but I am going to get the thermostat replaced anyways. Thanks."

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There are a couple of possible problems Carole.
First one is there may be a blockage inside the heater core causing poor flow of the coolant from the engine which gives you the heat.
If this is the case the core will need to be flushed out or possibly replaced.
Second problem may be the door that is supposed to move inside the heater box that changes the air flow from cold to hot may not be working properly. The controls may be defective or the door is seized.
Because your heater in the back is working well the thermostat and the coolant level should be OK.

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