Question about 1999 Pontiac Montana

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2000 pontiac montana is not blowing hot air.

I have replaced the thermostat, engine coolant and climate control module. I have also looked into the heater selection flap driven by an electric motor in the heater box and I am satisfied it is working. I have noted that the auxilary coolant pump for the heater core is not working and have hard wirred it to a switch. Even with it hard wired the van still does not blow hot air. I am satisfied that there is cooland passing through the heater core as both hoses are hot and feel as though there is movement. My questions are: Where is the switch that controls the auxilary coolant pump, from the schematic it is feed from a fuse witch is good, to the switch then the pump.
I have also read that there is a chance that the problem could be a programing failure in the powertrain control module after a thermostat fails. That would suggest the module needs to be reprogramed. I dont get it, does that seem practical? My last question is what is wrong with this van...please help

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  • drfallis Dec 18, 2008

    our 1999 pontiac montana heater is not working. He has flushed the system out and it still is not heating up. He replaced the thermostat also. What could this be?

  • Anonymous Dec 31, 2008

    We have no heat as well in our van. I was hoping it would be a simple fix, perhaps a thermostat, but I am a little worried now after reading this thread! Anyone find a solution?

  • Anonymous Jan 16, 2009

    please? Do you know how to get heat inside

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It seems to be the only thing left would be the heater core replace that and see if that works here to help Shaun

Posted on Nov 16, 2008

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1 Answer

2000 pontiac montana blows cold air but does not heat up


Check your flapper doors and blower/ducts for clogs or problems.
Also the cooling system thermostat could be stuck open. Auto heaters have a tiny radiator heater core that uses hot engine coolant to warm the cabin air.
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2003 Pontiac Montana heat gets hot in front, blows but seems weak, and no heat on rear controls but blows ******* rear. what is going on?


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My 2000 Montana gauge is showing that's over heating even when it's driven a short distance and when driven on the freeway it's not smelling like its over heating or there no steam coming


If the gas gauge does not work correctly and the temp gauge reads hot, you could have a problem with the instrument panel.
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We have the same problem. It's an air pocket in the cooling system. The cause can be anywhere from not filling the system all the way or most likely a leak has developed and air has entered into the system as the coolnt level has dropped. The coolant light goes off and on as the air pocket moves around.

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I have a pontiac montana 2000 my problem is i dont have warmth in front of in my heater and behing it is very warm


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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