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2004 Impala heater fan doesn't blow air - 2005 Chevrolet Impala

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Posted on Jan 02, 2017

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SOURCE: '98 S-10 heater blowing cold air - not hot air

will the air flow switch from floor to the mid to defrost? if so then we have a problem with the tempature door actuator. easy to replace just in tight place. Keep me posted for more help or if this was any help thanks

Posted on Jan 31, 2009

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SOURCE: 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!)

Posted on Sep 22, 2009

Testimonial: "Very helpful! And I appreciate the input very much!"

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SOURCE: The Heater Fan in my 2000 Chevy Impala (3.8l, if

your problem is your blower motor resistor. change that and it will fix the problem promise!!!!

Posted on Sep 28, 2009

  • 44 Answers

SOURCE: automotive heater is blowing warm air on oneside

Temperature actuator failed internally. Vehicle needs a temp actuator for whichever side you can not control.

Posted on Oct 03, 2009

  • 44 Answers

SOURCE: my heater is blowing out cold air in my 2005

I can suggest three things that will normally fix this.

They are:
1. Fluid level
2. Clogged Heater Core
3. Bad Thermostat
------------------------------------------------------------------------------------

Section 1. Fluid Level
First, check the fluid level in the radiator (not the expansion/overflow tank) when the car is cold.

You will need to remove the radiator cap (push down and turn), as I say, when the car is cold so you don't get burned. If low, start the car with the cap off, turn on the heater and top off the radiator with antifreeze when cold then again after the car gets up to normal operating temperature. The thermostat will normally be open to the heater core at that time. Top off the radiator with the car running (since you have the cap off there will be no pressure build up so this is safe to do).

Recap the radiator making sure it is all the way on (push down and turn) and check your heater.

If no heat, feel the rubber hoses that go into your heater core. These are typically on the firewall and close together. Feel both hoses.

If one is hot and the other is cold, do the steps in section 2. If neither one is hot, skip to section 3.

Section 2. Clogged heater core

With one hose hot and the other cold... you have a clogged heater core (a small "radiator" inside the heater). One way to fix this is to back-flow the heater core. This can be done without removing the heater core with a garden hose. To do this, remember which heater hose is cold.

Remove both hoses that go to the heater core at the firewall, you will then have two metal pipes that come out of the firewall. Take a garden hose and force water into the "cold" water pipe. Sometimes you will need to get another hose that is slightly smaller than the pipe at an auto parts store or, cut the end off the garden hose to get some good water pressure into the heaters core from the garden hose. This will force water in the reverse direction it normally flows and blow out gunk that probably has collected inside it.

If nothing comes out (really clogged), you will need to replace the heater core or take it to a radiator shop to be cleaned and reconditioned.

You may want to flush the whole cooling system as well because that gunk came from somewhere.

Section 3. Bad thermostat

If neither heater hose is hot... you probably have a bad thermostat and this should be replaced. You can normally find this by tracing the top, large main radiator hose to where it connects to the engine block. The thermostat is normally inside where this large hose connects to the block. (make sure to use a new gasket and silicone to seal it).

Good luck and stay warm this winter! -Dan

Posted on Oct 14, 2009

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1 Answer

04 impala heat stopped working but fan works


Are the heater hose hot to the touch ? Two hose's from the engine that go to the firewall an into the heater core ! Manual or automatic temp. control ? Do you feel air blowing out of the vent's ? cold ? Temp blend door actuator could be bad !

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Why doesn't my heater work in 2004 Chevrolet Impala


First check the Fluid level in the Radiator while engine is cool and add if necessary. If that is ok, then you probably have a bad circuit board on the Blower fan, or the blower itself, those are together under the passenger side dashboard. water leakage caused my wife's to go because the drains at the bottom of windshield were clogged with dirt and rotting leaves. Cost around $50-$100 if you do it yourself and get parts online cheaper!

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2004 impala..The heater blows cold air when at idle or when i stop at a stop sign. When I am driving the heater is blowing hot air. the antifreeze level is OK and the engine is at operating temp. Any...


A couple of things come to mind. One is the thermostat is hanging open. The other is the cooling fans are running when they shouldn't. With the car idling, open the hood and see if the fans are blowing. Do you have a temperature gauge in the dash? Should be reading about 200 degrees all the time. Maybe a little less at highway speeds but not below 190 degrees.
The other thing is the heater core may be plugged. Have you changed the anti-freeze and flushed the system recently? Added any StopLeak to the radiator?
Also... if the heater temp controls are activated by vacuum (I'm not sure on your model), you may have a leaky vac hose to the heater control panel.
Could be any of these and could something else. I tried to hit the obvious ones... :)

Good Luck.

Nov 23, 2010 | 2004 Chevrolet Impala

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Would the heater control valve malfunctioning make the engine overheat blowing hot air out the heater one moment,then not blowing the hot air, temp gage spikes 225 plus. The motor takes awhile to heat up...


Heater control valve malfunction will not cause engine to overheat unless coolant is leaking externally...Overheating going down the road can be the result of a few different things...Partly clogged radiator...Insufficient air flow due to possible fan problem...External coolant leak...Make sure fans are operting properly and have cooling system pressure tested for leaks...Gaining and losing heat on the inside of the vehicle usually means system is low on coolant but you must find out where coolant is going

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2004 Chevy Impala no heat. Fan OK. Engine warms up in normal time. 1 heater hose hot other one is not. Adjusting the heater control doesn't do anything. What controls the flow of water through the heater...


Your heater core is clogged. You can fix it. Disconnect the two heater hoses and put one into a bucket. Use an air compressor to blow into the other - it'll flush the contents into the bucket. Then reverse it - put the hose you blew into, in the bucket, and blow into the one that was in the bucket. This way, whichever side of the core had the clog, you can blow it out. Reconnect the heater hoses, and then burp the system or you can end up with air bubbles in the cooling system that can cause you to overheat. Click my screenname, go to Tips and Tricks, and follow the procedure there - it'll walk you through the whole procedure step by step.

Dec 23, 2009 | 2004 Chevrolet Impala

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