heater blows cold air when at idle even when temp is at normal?

5

Asked by Mar 09, 2013 at 11:50 PM about the Chevrolet Impala

Question type: Maintenance & Repair

when the car is accelerating it blows warm air but as soon as u come to a stop and idle say st a light
it blows cold air ,even if u free rev it ,it stays cold ...Any help please!

19 Answers

The device known as the thermostat is supposed to let the engine warm up, then as soon as the coolant reaches 195 will open up and let the warm coolant circulate thru your heat exchanger...if it never gets up to 195 because it is stuck open, you will have minimal heat, just as you describe....in summation, change the thermostat and all will be skippy in skippy town.

21 out of 21 people think this is helpful.

...also 195 is operating temperature...if it never gets there you'll have incomplete combustion, resulting in smokey exhaust and poor acceleration...if you didn't notice.

7 out of 7 people think this is helpful.

be sure to have your mechanic 'belch' the heat exchanger or it will become air-bound after the thermostat replacement.

13 out of 13 people think this is helpful.
107,485

The dampers for the duct work of heating systems are controlled by vacuum. If at idle and car is at operating temp with heater on and you feel air coming out the vents but its cold and without touching any controls you start to drive and warm air starts coming out of them I would check for a vacuum leak going to the controller. As you drive faster the vacuum increases and will provide enough pressure to move the damper but at idle with the vacuum leak not enough pressure there to move it. This vacuum line will be coming from the intake thru the firewall to behind your heater controls. This is what I would check after you check all of what bob stated. Have to have heat in the heater core first.

28 out of 28 people think this is helpful.
63,065

Sounds like a coolant flow problem. Newer Impalas have electronic motors that control the doors under the dash for air temperature. Could be a partially clogged heater core. HTH. -Jim

6 out of 6 people think this is helpful.
550

Same with my 05 Impala. I changed the thermostat after it started blowing cold air. No improvement. I bled the brass bleeder on top of engine, filled resevoir, etc. It gets warmer the more gas you give it, then when letting off gas goes cold again. Both hoses to and from heater core get hot, so I am at a loss...

55 out of 55 people think this is helpful.
63,065

Sounds like the air temperature door under the dash isn't working correctly. HTH. -Jim

10 out of 10 people think this is helpful.

I am having the same exact problem in my 05 Grand Prix... going to change the thermostat tomorrow.

6 out of 6 people think this is helpful.
160

My car is always doing the same thing. Blows hot air until I stop. is this a Chevy thing or what? I have a 2007 Saturn aura, same as a Chevy Malibu .

10 out of 10 people think this is helpful.
180

I wish I new what was going on. I changed my thermostat, radiator, radiator cap, anti freeze, and I still have the problem. At idle, its cold air. driving down the road, warm air. I have a 1995 Mitsubishi Montero SR that I purchased new. A great machine, but this is puzzling.

17 out of 17 people think this is helpful.
450

I've been having the same issue with my 2007 impala. Done many coolant flushes and replaced thermostat. Recently had it flushed again, heater was working for about a month now it's blowing hot air only when I'm hitting the gas. Been having this issue for two winters now. My mechanic has no idea what's going on. thinking about replacing heater core? Any suggestions?

45 out of 45 people think this is helpful.
140

I fixed this issue for good in my grand prix. What it is is the coolant isnt being filled properly. Try running the vehicle for 5-10 minutes with your radiator cap off, and after it has been circulating for a little bit, fill it with coolant from the open cap and allow it to fill up your coolant container. This will flush out your bubble and solve you problem. At least it di for me...

14 out of 14 people think this is helpful.
160

I took mine in. It was a blown head gasket. Thank god it was still under warenty. It would have been close to 2 grand

6 out of 6 people think this is helpful.
70

I have tried several things on my 07 Impala. Total tune up including new thermostat. Nothing. Just had the heater core replaced, still no hot air when idling. Not over heating so no water flow problem. I will try the radiator, cap off while idling, adding coolant directly to opening and see what happens.

7 out of 7 people think this is helpful.
40

I changed my thermostat n my 2009 impala and done a flush and then my car started to do right on heat

4 out of 4 people think this is helpful.
100

This problem has happened on all 3 Impalas I have owned. It is none of the problems listed above---The engine coolant cross over pipe and gasket needs to be changed. Chevy has had problems with this for years. There currently is a new design that plugs the hole, but not so for the older models. The part numbers are 000000000012623852 and 000000000012623853 and 000000000012346290. The parts cost around $50.00.

8 out of 8 people think this is helpful.
50

I have the same heating issue and have done all of the above. I believe this is a Chevy issue that they need to do a recall on.

5 out of 5 people think this is helpful.
100

I'm not sure if they have done a recall on this, but there has been bulletins on it. You can ask your dealer to pull the bulletins. My car is by far no longer under warranty, but each of the previous times it has been covered under warranty.

2 out of 2 people think this is helpful.
20

I have owned two 2007 Impalas and both had the problem with going cold at idle.My mechanic found out there is a high spot in the radiator hose that can hold an air pocket.He does a procedure with a funnel in the radiator while it's running to get it out.I believe it has some kind of a seal at the funnel so the coolant can be higher than the air pocket

2 out of 2 people think this is helpful.

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