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Chevrolet Impala, Sedan
#3565 of 3636 06 Chevy Impala/ Heat goes out when I stop
Oct 28, 2008 (8:56 pm)
I purchased the 2006 Impala new in Nov 2005. I've had this problem the past few winters, but just now thinking about it since it was chilly this morning. The heat works great until I stop, then it just goes out. Air is still blowing, but no heat. Soon as I go, the heat starts working again.
If I stop at a redlight I freeze until the light turns green.
I think the warranty has expired since I'm over 36k miles. Any advice I can do myself will be much appreciated.
#3566 of 3636 Re: 06 Chevy Impala/ Heat goes out when I stop [brad38]
Oct 31, 2008 (5:59 pm)
One thing you may want to check is the coolant level in the coolant reservoir. Check it when the engine is cold, and make sure the coolant (Dex-cool) is at the cold level line on the reservoir.
Low coolant can cause car heaters to be inefficient. I know the coolant level in my '06 tends to drop over time. I have had to bring the level back up several times in the past 2 years...I always keep a bottle of the pre-mixed Prestone Dex-cool handy
#3567 of 3636 Re: 06 Chevy Impala/ Heat goes out when I stop [brad38]
Nov 22, 2008 (7:51 pm)
Had same problem with my 2007 Impala. Service made repair. Said it was due to low pressure/air in coolant system hoses. In basic terms he said they had to remove air from hose system and fill with coolant. He expressed that I could not correct by simply filling the reservoir. Problem has not returned.
#3568 of 3636 Re: 06 Chevy Impala/ Heat goes out when I stop [brad38]
Dec 21, 2008 (11:11 am)
I have an 05 and experience the same lack of heat when stopped problem. I can fix it temporarily by adding coolant, but apparently it just leaks out again (or something!) because the problem comes back eventually. Sometimes immediately...sometimes weeks later.
I've also noticed an excessive gurgling sound in the engine compartment, but it seems close to the firewall. It seems to happen more within the first 5 minutes of running, but I've heard it even after it's been running for an hour. I also notice the tell-tell odor of coolant when I'm standing next to the passenger door retrieving my briefcase after I've parked in the morning at work. I've never noticed (although that doesn't mean it's not there) any coolant leaks/puddles on the ground.
I've seen others mention the temp gauge. Mine usually hovers about halfway between cold (140 degrees?) and straight up (170 degrees?). When I have the lack of heat problem, the gauge is usually much closer to straight up and fluctuates a great deal.
Anyone have any ideas? I've had a friend tell me that it sounded like a heater core about to need replacing. Yikes!!
#3569 of 3636 Re: 06 Chevy Impala/ Heat goes out when I stop [spyderchick]
Dec 23, 2008 (8:30 am)
Sounds like the water pump is bad. The water pump on my '06 failed at 33,000 miles and I had symptoms similar to yours.
If you are still under warranty, or have a trusted mechanic, they should easily be able to pressure test the coolant system for leaks. After the pressure test on my car, the dealer said my water pump was "really gushing". They replaced it and all is well again.
Dec 27, 2008 (11:14 am)
Have a 2006 Impala 59800 on it and last winter lost my heat at idle. Took it to dealer and had the system bled and all was well. Here i am again this winter and have the same symtems. Back to the dealer again ,they do a pressure test and say i need new head gaskets as they are the cause of the problem. Gaskets are replaced under extended warranty and all is well until i get home and let it idle, and you guessed it no heat at idle. Back to dealer again this time they tell me it needs to be BURPED. Once again this is done and all is well until now 2 1/2 weeks later no heat at idle. Any ideas anyone as the 60 k warranty is over.
#3571 of 3636 Re: No Heat [bustedknuckl1]
Dec 27, 2008 (12:19 pm)
When the engine is cool, and the car is sitting on a level surface, make sure the coolant (Dex-Cool) in the reservoir is at the cold level line. Also, remove the radiator cap and make sure the coolant is topped off to just below the cap. If any of these need to be brought up to the proper levels, do so.
Button everything back up and let the car idle. Turn the heat temp. all the way up and let the car run for several minutes. Gently rev the car in park (make sure the brake is set!) a couple of times as well. With the coolant topped off, the heat should blow hot even at idle. If this doesn't work, shut the car off and let it cool down for a couple of hours.
After it has cooled down, pop the hood and check the coolant levels again. The coolant level in the reservoir should be OK, but if there was air in the system you may need to add coolant again after checking under the radiator cap. Bring the coolant level back up, and button everything up again.
Start the car, set the heat temp. on high, and let the car idle/warm up one more time.
The whole goal with this process is to try to get as much air as possible out of the system and get the coolant flowing through again. You do not indicate which engine you have. If it is a V6, also make sure the radiator cap is an 18psi cap like what is installed at the factory. I briefly installed an aftermarket 15psi cap on my 3.5L V6 and had the no heat at idle problem. I put a factory 18psi cap back on and had no further issues.
If the radiator cap is 18psi, and the coolant system seems "full" after a couple of the aforementioned cycles, it may be something other than air in the lines. But the coolant check thing is something that can be done at home before paying a dealer/mechanic to check it out again.
Best of luck to you!
Dec 27, 2008 (1:12 pm)
Thanks for the info . I'll give it a try but i cant help but wonder if the levels are low , where did the coolant go?. I suspected that the head gaskets were the culprit last time even though there were no signs or smell of external leaks but i'll keep in touch and let you know. Thanks again.
#3573 of 3636 Re: No Heat [bustedknuckl1]
Dec 28, 2008 (9:38 am)
Coolant tends to mysteriously disappear in these cars. The coolant level in my car drops gradually. I am in the habit now of checking it everytime I have the hood up. I use the 50/50 pre-diluted Dex-cool offered by Prestone. I have a container of it in the garage, as well as one in the trunk of the Impala. I am just more comfortable keeping it around.
My parents had a '03 Impala with the 3.8L V6. The Dex-cool in their car also just disappeared. They also had to check it regularly and kept the Prestone pre-diluted Dex-cool handy as well.
From what I have read, mysterious coolant loss is not uncommon on Dex-cool vehicles.
#3574 of 3636 Heat stops in my Impala 3.9V6
Feb 06, 2010 (4:24 am)
My heat also stops blowing at a stop.I also hear a girgling sound in the dash.The strange thing is a 'ticking' sound from the dash.It will 'tick' about 10-15 times randomly.If I unlock the car with the remote,if I shut the door?It was worse it first.It would 'tick' as I went down the road.I noticed if I changed the vent circulation in the car it would stop?It is loud enough you can actually feel it if you put your hand on the dash.(passenger side)Im out of warranty and dealer wants $100 just to look at it.We just moved and I dont have a dealer I can trust here.They may be honest but I dont have the money for the gamble.I have worked at dealerships before and know of the wild goose chases that get expensive and you are stuck once you start.Can anyone help me?Thx