Question about 2008 Chevrolet Impala

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Heater blows cold air at low speed and idle in my 2008 Impala

Antifreeze level is fine. High rpm,high heat. Low rpm,low heat

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5 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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geo5734036
  • 528 Answers

SOURCE: heater only blows Very luke

Read all of these instructions before starting this job.
First test your heater core for flow by disconnecting both heater core hoses from motor and forcing air from an air compressor into one of them watching for flow from the other. If you have no flow then you may need to backflush your heater core - it is possible you have blockage in it. Your local auto parts store has a backflush kit you can buy that will have a backflush valve ( to be added to your supply heater core hose ) and an additive to put in your coolant system. The kit will not include new coolant so you will need to get that too. Install valve and connect a garden hose.Run motor specified time in the kit. Remove lower hose from your radiator and turn on the water from the hose full blast. Watch the coolant coming out from your radiator to see if any chunky stuff comes out - also watch for the color of the flow. Run water until it comes out clear, then shut off water and disconnect garden hose. Allow system to drain, reconnect radiator hose and cap flush valve. Refill coolant system, turn heat on high and run motor until it is warm. Top off coolant in radiator ( be careful - the pressure may cause coolant to spray out when you remove cap - put a rag over the cap before you remove slowly). If you do not have warm air at this point you may have a bubble in the heater core and may need to block rear wheels then raise the front of the vehicle until the radiator cap is higher than the heater core. Restart vehicle and turn heater on high . Check coolant level in radiator and top off, then cap radiator and shut off motor. Lower vehicle and start again with heater on high. If you still have no heat then your heater core may be plugged. To check, remove both heater hoses from motor and force air from an air compressor into one of the hoses, watching for flow from the other hose - if no flow then core is plugged and needs to be replaced, but if you have flow then you still have an air bubble in the system and need to purge using the above steps until you have heat.
Hope this helps and please rate my solution - good luck!!

Posted on Nov 29, 2010

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deanhornberg
  • 9 Answers

SOURCE: Temperature gauge fluctuates and the heater blows cold air

Definitely check your fluid level in your radiator. Top it off all the way. I've seen that happen multiple times on cars that were low on anti-freeze. If that doesn't work try replacing your thermostat. It's cheap and the easiest place to start if topping off the fluid doesn't get you fixed up.

Posted on Aug 29, 2012

roniecon
  • 6918 Answers

SOURCE: a/c blows hot air at idle

u have a trinary type switch on the high side somewhere on the high side,,,it may have 2 or more wires going to it and it is mounted on the high side line/or compressor,this is ur problem

Posted on Jul 09, 2009

  • 17 Answers

SOURCE: Heater only blows out luke warm air no antifreeze

I just had the same problem with my 1999 Silverado.I had a clog in my heater core,so I back flushed the heater core and then ran water throught the otherway.It worked and then replaced the cabin filters and now I get lots of heat.Be very careful removing the heater hoses because they have plastic connectors from the heater hose to the heater core.I ended up replacining the white connector.

Posted on Nov 15, 2009

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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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I have a 2003 chevy impala. Just recently come acrossed in issue where the heater blows nothing but cold air even with the temp gauge going as high as it can get. Weather its at an idle or being driven....


providing your coolant is full cause low coolant will cause no heat
and your temp gauge is normal in the middle then most likely u have a bad blend door actuator usually on the passenger side

Feb 25, 2015 | 2003 Chevrolet Impala

1 Answer

Not Overheating, Smells like really hot antifreeze after I drive, a/c ok heater heats but when stopped air gets cold...stummped..thermostat?, Leak?


check your hoses and make sure its not getting low because when it gets low the hoses can get hot enough to expand and spit out antifreeze without overheating

May 18, 2013 | 2008 Chevrolet Impala

2 Answers

Heater blows cold air when the truck is idling or in stop and go traffice


a question to an answer: is your truck has any heat when you rev it 2000 rpm, or above?
have you check your coolant level? if level is low you have a small coolant leak, a water pump may be at fault, and causing air pockets in your heater core, check for leaks your self, dealer wont tell you if vehicle still under warranty.
good luck

Feb 03, 2011 | 2006 Nissan Frontier

3 Answers

Why my 2006 impala heater blows cold air in park or stop light, but blow fine when accelerating.


have you checked coolant? if it is low will do this. if full then probably heater core restricted need to back flush core

Feb 18, 2010 | 2008 Chevrolet Impala

4 Answers

2004 Chevy Impala no heat from defrost or heater


No heat is often a symptom of low coolant, usually followed by overheat. There are other controls that regulate heater, but right now, re-fill the cooling system with engine running and heater on high, then check for leaks (coolant you lost went somewhere...you need to determine where) Low coolant will damage your engine. Take care of that first, then if heater still does not work, then do diagnosis on that. (if you loose the engine heat won't matter, will it!)

Sep 22, 2009 | 2004 Chevrolet Impala

1 Answer

At idle speed,the heater blows out cool air,but upon acceleration


1) Check antifreeze level !
( Open Radiator cap when the car is cold ! )
If low - Add. ( Not on your drive-way - as it will leave a greasy stain ! )

2) Your thermostat may be defective or missing........( May be taken out by someone who did NOT want you to know the car overheats........) Have the Thermostate checked at mechanic.

LMK ( Let me know )

Apr 11, 2009 | 2004 Chevrolet Impala

1 Answer

2008 Chevy Impala, was in a front end collision, the heater only blows hot air when the rpms are above idle. when at idle it blows cold. Any ideas?


There's probably a little vacuum actuated valve in one of the hoses going from the engine block to the heater core. make sure this valve is working.

Also... check coolant level

and

Your water pump may be marginal, only circulating adequate collant at engine speeds above 1000 RPM or so.

Mar 08, 2009 | 2005 Chevrolet Impala

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