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post #1 of (permalink) Old 12-19-2011, 04:37 PM Thread Starter
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no heat at idle/stop

I just purchased a 2008 impala ltz

The heater works great when driving, but doesn't blow hot air at stop/idle.

any ideas?
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post #2 of (permalink) Old 12-19-2011, 04:58 PM
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so it still blows air its just not hot anymore? will increasing the rpms while at idle make the heat come back?
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post #3 of (permalink) Old 12-19-2011, 05:11 PM
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First check your coolant levels in your radiator and reservoir tank.


Poor Heat at Idle
Models: 2006 - 2009 Chevrolet Impala

Poor heat at idle, however, if the engine RPMs are raised the concern no longer occurs.

1. With the engine cooled off, remove the coolant pressure cap.
2. Remove upper heater core hose from the metal pipe on the engine.
3. Add coolant to the metal pipe, until full.
4. Raise the rubber portion of the heater core hose as high as it will go with it still attached at the heater core. Using a funnel, add coolant until the hose is full.
5. Reconnect the heater core hose.
6. Start engine, have assistant raise the RPMs to about 1500 to 1700 RPMs, top coolant off at engine, then before lowering engine RPMs, install the coolant pressure cap.
7. Fill coolant reservoir as necessary, then check the heat at idle.

Note: If there is still a lack of heat at idle, perform the cooling system draining and refilling procedure
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post #4 of (permalink) Old 12-19-2011, 06:29 PM Thread Starter
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yeah, increasing the rpms brings heat right back...
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post #5 of (permalink) Old 12-19-2011, 06:38 PM Thread Starter
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would running the car for a couple minutes with the reservoir cap off acheive the same results?
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post #6 of (permalink) Old 12-19-2011, 06:46 PM
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I dont see how just taking the reservoir cap off will do anything at all...
Check all of the coolant levels when the engine is cold first
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post #7 of (permalink) Old 12-19-2011, 08:19 PM Thread Starter
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where is the upper heater core hose? I am a fairly capable DIYer, but new to this car...

do i re-attatch the hose to the metal pipe after step 3?
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post #8 of (permalink) Old 12-19-2011, 08:47 PM
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The upper heater hose should look something like one of these two..It will come out of your firewall and connect to a pipe...

follow the steps in order..step 5 is when you reconnect the hose..
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post #9 of (permalink) Old 12-20-2011, 09:30 AM
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See my message about a week or so ago. I had the same problem after replacing the anti-freeze. It's an air bubble in the heater core tubes. I took cap off when engine was cold and kept squeezing upper radiator hose until bubbles stopped coming out the filler neck. I topped it off with almost a quart and it works just fine now. Upper heater core hose is the highest point in the system and gets air bubbles.
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post #10 of (permalink) Old 12-20-2011, 10:45 AM Thread Starter
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^ thanks

i'll let you know how it goes...how long does it take for this car to cool down before taking off the cap?
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post #11 of (permalink) Old 12-20-2011, 10:48 AM
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It would be safe to give it a couple hours at least. It would be best to to it on a day you didn't have to go to work, and do it first thing in the morning before the car is driven that day.
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post #12 of (permalink) Old 12-20-2011, 06:28 PM Thread Starter
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So I did as Flyboy ray suggested & it was suggested on other threads. I took the radiator cap off, filled coolant up to the top & squeezed the upper radiator hose. This caused the air bubbles to release & bubble up. I repeated this fill/squeeze process about 4 or 5 times...I must have used 1/2 gallon to do this process and add to reservoir...

When done, I fired the car up & warm air was blowing through when the engine warmed up. I took it for a spin to get it to hot operating temp & it was blowing HOT air through at full speed, stop, park, whatever!!!! WOOOOHOOOOO!

I just hope this is a permanent fix & that there isn't a leak.

I just bought the car on sunday from a chevy dealer. I am surprised they didn't find this a problem during their pre-sell inspection...
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post #13 of (permalink) Old 12-21-2011, 10:39 AM
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They obviously didn't check it that thoroughly. I'd take it back and have them pressure test it to be sure.

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post #14 of (permalink) Old 12-22-2011, 04:05 PM Thread Starter
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I took it back, they replaced the coolant crossover pipe, couple gaskets, etc. Free of charge!!!

2008 Gray Impala LTZ
Love this thing.
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post #15 of (permalink) Old 12-25-2011, 10:00 AM
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Glad you got it fixed. I bought my car last December. The windshield was full of ice, so I started the car and left the blower on low and heater on defrost. I came back about 15 minutes later and temp gague was up to 1/2 (normal) but it was blowing cold air. Step on gas just a little and it's blowing hot air. This forum helped me to figure out what was wrong. The Chevy dealer had no clue.
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