Question about 2004 Chevrolet Silverado 1500 Crew Cab

3 Answers

2004 silverado ac heater problem

Driver side works fine passenger side stuck on heat no matter what the settings it has dual control

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Try unhooking battery for a few minutes this will cause actuators to do a full sweep and reset. if it is still stuck then will need to replace the actuator for blend door on that side

Posted on Dec 31, 2008

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I had this same issue 2004 2500HD duel climate zone.Some times when I hit a bump would go to hot.Turn off truck and restart it was fine.Dealer checked plug in and said wire were loose,then door actuaters was bad.I ended up replacing the heater control myself and it worked fine ever since.

Posted on Jan 04, 2010

  • pkizziar
    pkizziar Nov 14, 2012

    Hey buddy did you just replace the unit under the radio head unit?

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Important !!! Check the Anti-Freeze Level.

Posted on Jan 04, 2010

  • rigby1972 Jan 04, 2010

    If Heater starts to go gradually... And only works when R.P.M.'s are high Pumping what little Anti-Freeze you have left through the motor and Heater Core; it may be a sign to add some Anti-freeze / H2O.

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2 Answers

2004 2500 6.0 Silverado ac blows HOT on alternate sides of vehicle while in Auto A/C mode.


Douglass, Your A/C may have lost it's programming, blend door actuator could be faulty or A/C could be low on refrigerant. You may have to take in and have a good Tech. diagnose and estimate repair.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
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Replace the door blend actuator behind glove box, approx $150 for part, Everyone I know with dual control on the silverado's have this problem.

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you may need to have the controller re-calibrated. There is a TSB at the GM dealerships on this. What is happening is the the blend door control for the pass side has OVER-travelled and is stuck in a default position. You can try to pull the Blue fuse under your hood for the HVAC, for about 5-10 minutes and put it back in. (with the engine off) Then restart the truck and turn the Climate control back on, and push and hold the Auto button for 4-5 seconds

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1 Answer

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