Question about 2005 Pontiac Montana

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2005 Pontiac Montana SV6 heater blows cold when slowing to idle

Our Montana Van warms up fine and blows hot air when travelling on the road. When the car slows to an idle the fan blows cold air. The temperature gauge is in the correct position and the fan speed and volume does not drop. The dealer is telling us this is within specs. We have had the van from new and never had this any other winter.

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How cold is it there and does your engine cool down any while going slow? If it does it may mean you need a hotter thermostat installed, My first thought would be to check the coolant level in the radiator and the coolant reservoir! Hope this helps and Merry Christmas

Posted on Dec 23, 2008

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Posted on Jan 02, 2017

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Hello...I have a 07 uplander an the problem is it blows cold air while its idling an warm to hot air when I'm driving...im not to sure of the problem


If you have recently serviced your coolant system or the reservoir tank has gone below the fill(low) mark I expect that you have an air lock in the heater hose.

Usually by keeping the reservoir full the air lock will pass as the engine goes through a few days of engine temperature cycles.

Keep an eye on the temperature gauge during this time and check that the reservoir is full.

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Heater temp on high only bows luke warm air after driving. A/C works just fine.Plenty of cold air from it


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Jan 27, 2016 | 2000 Chrysler 300M

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2002 Nissan Altima Cold air blows at idle but is warm at higher engine RPM


Heater core may be clogged. Try flushing it to see if water flows through freely. Also check the heater water control valve for restrictions.

Dec 15, 2017 | 2002 Nissan Altima

1 Answer

2002 toyota camry temperature and air conditioner gets hot when idling


indicates that the fan is not drawing air through the radiator at idle or low road speeds
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1 Answer

My 2001 venture van rear air is blowing hot air


often on the vans with rear air the air dor acuator goed bad and can no longer switch from hot to cold. also the swich itself will often go bad. this can be caused by sticky fingers damaging the inside of the switch. sometimes a good cleaning in warm water will fix a sticky switch

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Nissan Altima no cool air blowing or hot air blowing


Hi!
It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.

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2005 PONTIAC mONTANA-NO HEAT


your radiator may have frozen the thermostat

Jan 05, 2009 | 2005 Pontiac Montana

1 Answer

No rear heat in pontiac montana '99


Warm up vehicle, then access heater pipes that run to rear of vehicle.  they should be HOT. if not you have  a circulation issue.  IF they are hot, then the blend door is not in the correct position.  this door directs air across a hot or cold core to create the correct air temp. check and update me.  

Jan 05, 2009 | 1999 Pontiac Montana

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