Question about 2005 Chevrolet Malibu

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No heat blows cool air constantly, no temp change when knob is turned

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  • mc7127 Aug 12, 2008

    it is a chevy malibu LS, 2005 V6

  • eml0426 Aug 20, 2008

    I'm not getting any heat from my car, it just keeps blowing cool air when i turn the dial. It seems as if the AC switch will not turn off?

  • Anonymous Aug 24, 2008

    exactly the same....

  • Anonymous Aug 28, 2008

    2005 Chev Malibu No Heat Blows Cold Air All The Time 3.5 v6

  • saskinny1966 Oct 16, 2008

    2005 malibu Maxx, heater control stopped working Sept 2008. Defrost turns on AC, Control knob has no effect

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I've had the same problem with my 2005 LX. The dealer replaced everything but the kitchen sink in the car. Now that my warranty is up I've found that if I spin the control knob real fast,{in either direction a few times } the function will return to normal. Sounds crazy ,but it works. Problem occurs in heat or ac mode.And it happened twice this year. Good luck. rmohiostate@comcast.net

Posted on Oct 20, 2008

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THE AIRDUCT EXCHANGE FUNCTION IS NOT WORKING , IT MAYBE THE CONTROL SWITCH ITSELF .WHAT TYPE OF VEHICLE IS IT

Posted on Aug 12, 2008

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1 Answer

2003 toyota highlander blower


try locating the physical tap that connects your heater hoses to the interior of the car. note what position that tap is in before and after you turn up the temp dial inside. whatever connects the dial to the tap may be damaged.

if the tap itself turns then the heater side of the blower may be blocked.

Feb 14, 2014 | Cars & Trucks

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1998 gmc surburban. front blows 82 degrees, rear blows 48 degrees. ambient is 91 degrees. this is with max-recirc-full tilt.the valve for the heater core does not change position no matter where i put the...


Hi John,
Your right with your diagnostics, you have a blend door problem. If your switching to cool air and it is still hot then you also have a heat exchange unit fault, this is the component that changes the water flow from hot to cool by shutting off. If it is not operating correctly this will give you constant hot air no matter where you temperature switch is positioned.
As for the warm air while the engine is cold, sounds like the blend door is still open to atmosphere tempreture and if it is hot outside will pull that hot air into the inside of the vehicle.
Have the heat exchange valve checked, and the only way the check blend door operation is to remove the wiring from the blend doors and have the circuit tested. If the circuit is ok then the blend doors will need to be replaced.
Hope this helps

Jul 24, 2011 | 1998 GMC Suburban

2 Answers

2005 RX8 heater is blowing cold air. Fluids are topped up.


You need to repair the heater core with a soldering gun.

If you do not have heat, or only have heat, IMHO it is most likey the AC/heater control unit. This is the part which has the AC/heat control buttons and knobs.

Easy Diagnosis:
The easiest way to verify this is to turn on the radio, press and hold the power on/off button and press and hold the scan-up button for a second (full second). The word "A/C TEMP" should appear on the left of the display and a number from 0 to 16 on the right. I suspect yours will have the number 0 (or 16 if heating only problem) displayed no matter where you turn the temperature control knob. If this is the case you could turn the temp. knob to full heat and see if it goes to 16 after pushing down or to the right on the knob.
In a working system, the number moves evenly in increments of 1, from 0 to 16 as you turn the temperature knob.

Easy Fix:
I was able to take mine out and solder 3 loose connections to fix it.

The beginning steps are the same as for any radio removal procedure and check for loose connections.

Dec 14, 2009 | 2005 Mazda RX-8

1 Answer

I have a 2002 Mercury Sable 3.0. I noticed when


The clicking noise is the motor for the "blend door". The heater core and the air conditioning side share the same ducting. When you move the knob a small motor moves the door letting the respective hot or cool flow happen.
The heater core is probably blocked. The engineers at Ford have the coolant hoses bypassing the core with a WYE at the firewall. The coolant takes the path of least resistance and stops FLUSHING the heater core and it eventually clogs.

Oct 12, 2009 | 2001 Mercury Sable

2 Answers

A/C will suddenly send out heat. Fiddling with knobs seems to help. What's wrong?


You have a broken wire connection between the temperature control knob and the circuit board behind the center dash console. Vibration causes the failure and once the control knob gets loose the solder connection fails.

For someone that knows how to remove the dash unit and can re-solder a couple of new wires this fix should take no more than 1 hour. Make sure that you apply loctite to the heat control knob spindle nut when you re-assemble it.

The dealer quoted me 750 dollars to fix this issue and I found out that it's a common failure for this year. I fixed mine virtually for free but it took some tools and about an hour of my time.

Jun 02, 2009 | 2005 Toyota Highlander

1 Answer

1986 VW Golf GTI 1.8 SOHC cooling issues, and heater blows cool


try changing cooland temp sender,your heater matrix maybe blocked(common)what temp is it running at have you checked it with a gauge?

Dec 22, 2008 | 1986 Volkswagen Golf

2 Answers

Cannot shut off heat


probably the heater control valve in the engine compartment usually mounted to one of the heater hose , the valve is broken internally and allowing hot water to constantly flow into the heater core, i would first check this valve by replacing it or by-passing it.

Nov 24, 2008 | Chevrolet Tahoe Cars & Trucks

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