Question about 2007 Pontiac Montana

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2007 montana - low rpm - under 1k - no heat.

After rpm goes about 1500 then heat works. Filled rad to right level. Got a bit more heat - but not enough here in Saskatchewan.

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  • 110 Answers

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

  • 393 Answers

SOURCE: 2002 grand prix se rad drain plug

drain plug may be broken lefty loosey righty tighty

Posted on Nov 16, 2008

  • 1 Answer

SOURCE: low coolant level in 2000 Grand Prix GT

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

  • 1985 Answers

SOURCE: no heat on idle approx 700 rpm but lots of heat

When the engine is cold,remove the radiator cap and make sure it is full,check fluid level in reserve tank too.

Posted on Dec 20, 2009

  • 2299 Answers

SOURCE: I have a Pontiac Montana (2000). That on my way to

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.
PLEASE RATE. By checking Four thumbs ups!
Thanks! Have a GREAT DAY!

Posted on Oct 16, 2010

  • 151 Answers

SOURCE: How do I adjust the idle on a 2000 Pontiac Montana van?

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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Just fix your heat, its the best option.

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With the car running because it reduces the back pressure have someone that knows how to do it remove the cap from the radiator and see if the radiator is full, not the bottle but the radiator itself. If the antifreeze is not moving from the bottle to the radiator it will overheat. Not having heat unless you rev the engine makes me think the radiator is either not circulating the water or it is low.

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It sounds to me like your coolant level is low. By increasing the engine RPM you speed up the rate of flow by the water pump and this will send some coolant to the heater core giving you heat. Top up the overflow bottle and this should help. you may have to repeat this more than once to get it properly full. Hope this helps.

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I would say check your coolant level, and change your thermostat. And see if it is high fans or low fans when they come on. There is a fan control relay down on the drivers side frame right under the air box that goes bad too if your fans arent working quite right to check if all else.

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It's the coolant in the heater core that your hearing,so you probably have some air in the cooling system.

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