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Chevy uplander blows cold air unless moving - BMW Cars & Trucks

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6ya6ya
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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: 2005 Pathfinder Heat Flow problem

I am having/had the same problem. My rear heater has not worked the last 2 winters, still trying to figure that one out. But I think I solved the front heat problem myself. The heater was blowing cold air while idling and hot air when the car was moving.

I jacked up the front of the vehicle, took the cap off of the reserve tank for the radiator, turned the car on and ran the heat (AC off) for 15 minutes. This is supposed to release any air bubbles in the coolant system and I did see air bubbles emerge as I was watching (this might be normal occurance, I'm far from a mechanical expert). Anyway, this did not immediately solve the problem, still blowing cold air as it sat there idling after 15 minutes. Dejected, I put the cap back on, lowered the vehicle and resigned myself to taking it to a dealer.

But a funny thing happened the next day, the coolant level was a lower (no leaks on the floor) so I filled up, and sure enough, when I started the car and let it warm up a little, hot air started coming out of the heater!!!

As far as my wife knows, I fixed the problem for the price of a bottle of coolant, so I am a hero...but at first I thought it didn't work. Here we are a month later and still blowing warm air and haven't had to replace any more coolant...the internet is a wonderful thing!

Hope this works for you, and I hope I can figure out my rear heater problem as well.

Posted on Jan 30, 2009

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SOURCE: Heater blows cold air unless accelerating

See my posted question under 2001 Mercury Villager: "HEAT BLOWS COLD WHEN CAR IS IDLING" I got an answer from chuck943 about air pockets and it was very helpful.

Posted on Feb 25, 2009

  • 6 Answers

SOURCE: Rear a/c not blowing cold, front works fine.

you may not have enough refrigerant. a low charge can cause the rear in this dual system to not work for beans. charge with a can of uv and find the leak. fix the leak. evac the system and recharge. i think you take 4 lbs, but check the accumulator sticker. you may want to just change the accum at the same time.

Posted on Jun 15, 2009

inspectmycar
  • 233 Answers

SOURCE: ac blowing hot air

the blend door actuator located on the air box (right hand side under dash) is prob. inop. worst case senerio the blend door its self is broken. I have replaced the actuator more than anything.

Posted on Sep 16, 2009

  • 1779 Answers

SOURCE: 2001 Dodge Caravan heater blows cold air when stopped

Have you checked the coolant level? What you describe is exactly what happens if the coolant level is low. When stopped at idle, hot coolant is not circulating through the heater core, so no heat. As the engine increases in rpm's when you pull away from the light, the water pump is spinning quicker, and some coolant is making it to the heater core. So check the level, and if it is low, keep an eye on it to see if it drops again. That of course indicates a leak somewhere. Get it fixed, as overheating the engine leads to costly repairs and worse case a new engine. Let me know how you make out with this.

Posted on Dec 05, 2009

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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.

Hope this helps?

Oct 05, 2016 | 2007 Chevrolet Uplander

1 Answer

2005 chevy uplander blows hot air when ac is on


sounds like you have had a leak in the sealed a/c system. get system pressure checked. it is probably the O-ring seals replace them and recharge system

Sep 19, 2013 | 2005 Chevrolet Uplander

2 Answers

My 2005 chevy avalanche only blows cold air until i drive then when I stop cold air Agian


One of two things has happened. Either your coolant has gotten really low (easy enough to check) or you heater core is starting to plug up.

Oct 14, 2012 | 2004 Chevrolet Avalanche

1 Answer

My 2007 chevy uplander blows heat only in the rear. the vents in front blow only cold air. what is the problem?


do you have the heat on up front there two seperate units check to make sure you have it on the proper setting up front

Dec 01, 2010 | 2008 Chevrolet Uplander

3 Answers

2008 Chevy Uplander has 21,000 miles. Nno heat from rear heater at idle. Disconnected hoses and flushed, water flowed good. Reconnected hoses and still no heat. Raised idle to 2000 rpm and got good heat....


Uplanders with the 3.9 engine are prone to no heat at idle speeds. Probably weeping head gasket. Air bubble trapped. Dealers will remove rad cap and let it sit at about 25 deg. angle for a couple hours. Good for awhile.

Nov 15, 2010 | 2008 Chevrolet Uplander

1 Answer

My truck is blowing cold air, on


Heater core would be your best bet, also check to make sure that the door inside the ductwork is actually moving from the cold air side the the hot air side. If you have the manual lever you should be able to feel it moving, if it's vacuum operated you should hear the air flow change as the door is moved.

Nov 09, 2009 | 2000 Chevrolet S-10

2 Answers

1996 Chevy Tahoe air conditioning not blowing cold air


That "thing" is part of the compressor clutch. When it’s spinning the clutch is engaged, when it stops the compressor is off. If it’s constantly cycling, you probably don’t have enough freon in the system. But remember, however the gas escaped before, it will escape again, unless you fix the leak.

Jul 14, 2009 | 1996 Chevrolet Tahoe

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