Question about 2007 Pontiac Montana
After rpm goes about 1500 then heat works. Filled rad to right level. Got a bit more heat - but not enough here in Saskatchewan.
Make sure you radiator is full. There are 2 bleeder screws for that engine because its really hard to get all the air out. If its low or has too much air in it, you won't have any heat at low rpms.
Second thing is that your heater core may be a little stopped up and needs flushed, or replaced.
Thirdly, i've noticed that the Montanas don't put out a lot of heat if you're setting. But you should have some heat to keep you warm. No heat is no good.
Posted on Jan 10, 2013
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Posted on Jan 02, 2017
I had the same problem this winter. The head gaskets were blown, took the block apart and replaced all the gaskets. Cost about 300 - 400 in parts and took one full day to finish with 3 men who aren't particularly experts but who aren't rookies to say the least.
Posted on May 24, 2009
No. It is not the thermostat. You are just low on coolant. The reason for the low coolant is either the fan is not working, the head gasket is blown, or the coolant system has a leak.
The fan is easy to check. When the temp comes up then the fan should come on.
The head gasket is easy to check also. Your oil will be milky white.
And if the radiator, radiator hose, or gasket leak can be harder to find.
The heater not working is because there is not enough water to heat the heater core.
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Posted on Oct 16, 2010
you cant adjust the idle ethere you have a problem with tps sensor or idle control valve let me know if check engine light is on ok ill help you
Posted on Nov 27, 2012
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