Question about 2005 GMC Sierra

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A/c temperature control

Have dual temp control but when the a/c is cut on one side( driver's) blows hot air the other side blows cold

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  • aachastain Aug 02, 2008

    Same issue only opposite sides. Driver side is cold, passenger side blowing hot when ac is on. Right before this started I had problems getting the fan controls to switch from floor to vent. The air went to defrost even though the indicator said it was on vent. That corrected itself when I shut the engine off at my nest stop, then this split heat started. Sounds like some sort of control module issue.


  • srqdevildog Aug 06, 2008

    I have a similar problem with my 2005, except mine blows only high heat on both sides. It used to reset itself when I stopped, but it will blow cold for a few minutes and then switch itself to heat.

  • rj_tx Aug 13, 2008

    I'm having the same problem with my 2005 Sierra. Driver's side switches to heat. I have to shut the engine off to reset the A/C control.

  • Anonymous Aug 19, 2008

    Having same problem Cold on one side, hot on other. 1005 GMC SIeraa 1500 SLT.

  • MEDavis Jan 09, 2009

    Does anyone have a price and source for the actuator?
    Also, instructions for replacing?

  • Alan Ward
    Alan Ward Dec 27, 2013

    Your blend actuator sensor has grease on the contact inside. A simple fix. See how to herehttp://www.tahoeyukonforum.com/forum/sho...

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DON'T BUY ANYTHING!! Your bend door actuator has grease on the contacts inside. It's a simple fix. See how here http://www.tahoeyukonforum.com/forum/showthread.php?t=17741

Posted on Dec 27, 2013

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  • Master
  • 1,450 Answers

It is your actuators going bad. need to replace the one for the side giving you problems

Posted on Sep 22, 2008

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  • 76 Answers

SOURCE: Dual Temp on 2000 Dodge Caravan

Sounds like a "mode" door issue. Either the door is broken or the motor that operates it is faulty. There are very few wiring issues with these motors, so I'd guess the door motor. Unfortunatly, the door is located inside the heaterbox and is not accessable without dash and heaterbox removal. This is a job for a qualified technician as the a/c system must be drained first. If the problem is a motor, then some are accessable by removing the panels aound the heaterbox. Listen for the door movements while operating in a quiet setting. You should be able to hear the door move if the motor is operating. Listen close, it's quiet.
Hope this helps, let me know if I can do more.

Posted on Feb 20, 2009

jagjeffery
  • 316 Answers

SOURCE: 2004 Chevy Silverado AC is blowing warm air on passenger side.

You have dual zones that are controlled by temperature actuators the passenger side has lost its memory or has gone bad you can put it in self programming by disconnecting the battery for ten minutes then hook it back up start the truck turn the temperature control on but do not touch any other controls let it go thru the self programming for about 6 to 7 minutes then select your temperature you want if it still does not work properly you may have a bad actuator or a bad connection at the actuator

Posted on Jun 03, 2009

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Air conditioning


On a w body car with a single temp adjustment control (not a dual zone) your problem should be a low refrigerant charge. Due to the design of this evaporator, a low refrigerant charge will cause the furthest areas from the inlet and outlet hoses (the drivers side) to not remove the heat from the incoming air. This allows the air on the drivers side to be outside temp but refrigerated on the passenger side. In cars with Dual Zone controls you must not only verify the refrigerant charge level, but also check the mode doors which control the air flow and regulate the temp. To check the refrigerant level do not use pressure gauges alone. Verify a proper charge level by checking the temperature of the two aluminum lines going in to the firewall of the vehicle. With the A/C set to high the temperatures should be within 5 degrees of each other. If not, then there is a charge issue. I hope this helps

Jul 11, 2008 | 1999 Pontiac Grand Prix

3 Answers

Only cold air on passenger side


I would assume with multiple people having the same problems, there should be a service bulletin on this issue. may want to call dealer with vin # to verify. sounds like a heater control issue under the dash. something i would leave to the experts for repair

Jul 06, 2008 | 2003 Buick Rendezvous

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