Question about 2001 Pontiac Montana

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2001 pontiac montana overheating no warm air when heat is on

I just bought this van and it is overheating and there is no heat, we just replaced the thermostat and flushed the rad. but no different any ideas

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  • classy_gene Mar 14, 2009

    I have the same problem with my van. My head gasket is bad and it is causing air to build up in the coolant system and not allowing circulation. My coolant level is fine, I hear is gurgle every once in awhile and wasn't sure what it was until one day the gauge pegs hot. Usually when a Temp guage goes hot you can turn the heat on High and remove some of the heat. Mine just blew out cold air. I removed the radiator cap after it had cooled and a bunch of air came out into the overflow tank. I bled the air out the system and has been running "normal" for several days. I have been told that these 3.4L are really bad about blowing head gaskets. Anyone have any advice about changing head gaskets?

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Might be a weak or failing water pump... Does it leak antifreeze or do you have to add antifreeze very often? When the engine gets to operating temperature squeeze the top radiator hose and see if you can feel pressure from the water pump forcing water through it.

Posted on Feb 21, 2009

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If you installed the thermostat properly (not upside down) then check the radiator for corrosion or rust, as this would have clogged up the heater core as well, If the rad is ok then you have a head gasket problem.

Posted on Feb 21, 2009

  • bxtor1 Jan 13, 2011

    we have the same problem and have already changed the head gasket a few months ago it was fine now it started overheating and has no heat but the head gasket was expensive and hard my husband did most of the owrk himself and still costed a small fortune if u find out what is worng please repost to help the rest of us out

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1 Answer

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1 Answer

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