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Chevy Silverado and GMC Sierra Climate Control



  • tcinaztcinaz Posts: 1
    I had the same problem with my 04,this was after i had a water pump installed.
    Heres what happens,when you remove the battery cable to service the truck and then reconnect it,the blend doors go to places they have not been in 100 years.If dirt/coke is in the door it sticks in a location.Remove the - battery cable for 5 minutes and then re connect it.This should discharge the caps and move the doors back to where they belong.,,,,,hey it worked for me and the estamate was 700.00 bucs .

    TC :shades:
  • jimm10jimm10 Posts: 6
    Did you ever get this fixed? If so, how? I have the same problem.
  • jimm10jimm10 Posts: 6
    My 2004 silverado developed the one side hot, other cold syndrome after a battery swap. Eventually, I got the driver's side cold and passenger side lukewarm. I tried the reset method of disconnecting the battery, waiting 10 minutes and letting it reset for a few minutes. Now, it is worse. the driver's side is blazing hot ( was cold ), and passenger side is cold! It changed places. I just had the system evacuated and recharged.
    Anyhow, after I reconnect the battery and turn the key to power it up ( not start engine actually ), the control panel lights up and is " operating" before I can turn it off and let the thing recalibrate itself. I can hear the various doors opening and closing.
    What am I doing wrong ? Please help.
  • ply1977ply1977 Posts: 3
    I have the same problem. When I start my 03 chevy silverado, I hear the vent doors opening and closing about 30 seconds. During that time I have air blowing through the regular vents. After that, the air only blows from the defrost vent. I tried to disconnect my battery cables to see if it would reset. No luck. I don't know what to do. I could take it in, but the cost I imagine would be high.

  • jimm10jimm10 Posts: 6
    New development, I removed the actuator that is right over the transmission hump. I could not find the passenger side actuator and I don't think I can ever reach the driver side one. Anyhow, I opened it's case and did not see any broken or cracked gears, so I reinstalled it. I figured out which way the door " closes ?", and tried to index the actuator by turning the key. It went way too far, I think. It would not even mate with the shaft. So I bumped it a little until it indexed in line and it slipped right in and bolted up. Now, I have very cold air on both sides for a few minutes. Then, it isn't nearly as cold on the passenger side and almost as cold on the drivers side. All the mode functions work as directed at least. Before, it was hotter than blazes on one side and sort of cold on the other.
    Does anyone out there think at least I am on the right track and should replace that actuator? Thanks for any opinions.
  • jimm10jimm10 Posts: 6
    Where exactly is the actuator for the driver's side? On my 2004, I think I saw it way up
    there, slightly to the left of the console. I don't see how I can get my hand up there. I was able to get to the one just right of the centerline of the console and about 2 inches above the transmission hump.
    I am also looking for the passenger side actuator and all I see is some sort of module
    near the blower motor on the case behind the glove box. Obviously, I am confused and need help. I can't find a diagram that helps anywhere. Thanks in advance.
  • seiversseivers Posts: 1
    ">I was having hot air blow from one side and cold from the other. It started after replacing the battery at the end of last summer. I have tried to reset the actuators by unhooking the battery cable (negative side only). Now when I start the truck I get cold air from both sides for about 15 seconds and then they both turn hot. I can turn the truck off and restart and I get the same problem. Does anyone have any suggestions?
  • jimm10jimm10 Posts: 6
    I had several different results from trying the various reprogramming techniques such as disconnecting the battery for several minutes and letting the system recalibrate. What seems to have worked for me, is that I removed the blend door actuator directly over the hump. Not too hard. I manually figured out which way the door needs to go to be closed.I did it by experimenting while the thing was running. Then, I reconnected & disconnected the actuator and fooled with it until the shaft would slide into the actuator socket easily and reinstalled it. It only has two screws and is easy if you have one of those very small flex socket drives. Not sure why, but it has been o.k. since. The dealer wanted $ 97.20 to recalibrate it and I almost bought a new actuator on line for $ 165. I saw a GM Buick TSB that advised recalibration and NOT replacement of the actuator unless it is clicking or if you see a cracked gear when you open it. I have no idea if this " fix" is permanent, but so far so good. I think actually taking it off and resetting where the shaft couples up had a lot to do with it. Hope this helps. Let me know if this works for you.
  • orgrabbitorgrabbit Posts: 1
    1995 GMC 1500 heater airflow direction not working at all it stays in the defrost position. Both lights for air recirculation and AC stopped working the same time I lost direction of airflow. No fuses are blown.All other controls work including fan speed and temperature. Any ideas?
  • My heat & A/C won't blow on High. All other fan speeds work. Seems everyone I've talked to has a different answer: Relay / High/Low blower switch / Speed switch / Etc...HELP !
  • obyoneobyone Posts: 8,065
    probably a diode located in the switch itself
  • I replaced the entire switch panel and it still does the same thing.
  • nashcatnashcat Posts: 1
    1999 Gmc Sierra. I had the Heater core replace begining of winter.Now that its hot outside no cold air. A/c WORKED GREAT BEFORE THE WORK WAS DONE ! any tips?
  • obyoneobyone Posts: 8,065
    no cold air = no R134

    Whether the heater core replacement had anything to do with it will require filling the system up with R134 and checking for leaks.
  • ccrealtyccrealty Posts: 1
    My 04 GMC Sierra started blowing hot air from the drivers side, cold air from the passenger side intemittently. Then the display started going crazy, changing temps by itself, changing blower speed, then just shuitting down. Now it only blows hot air and will only do that for a few seconds before shutting down. Have done the comper reset twice, worked the first time. Any ideas?
  • kmarlarkmarlar Posts: 7
    I have a 2000 Silverado that will blow cold air when you first turn the air on. After it runs a few minutes it starts getting warm. I can turn the a/c off for a few minutes and when I turn it back on it will be cold. Sometimes it will stay cold and sometimes it will get warm again. I have checked the low side pressure and it is good.
  • obyoneobyone Posts: 8,065
    Sounds like a problem with the controller rather than the system.
  • I have a 2005 Sierra 2500 HD and the blower is not working properly. It barley forces air through the vents on HI and blows with the same force on LO or wherever the knob is at. Im thinking maybe the switch went bad but Im not sure. Thanks for any thoughts on this
  • clovelesscloveless Posts: 5
    Try this site. It will tell how to fix the problem. If it doesn't work, go to Register, if needed, go to the bottom of home page to: electrical and electronics. This is a wonderful site and one can learn almost everything needed to maintain a truck.
  • greg94greg94 Posts: 4
    Our fan totally quit (after some earlier spurts) and it was the resistor in the fan harness....
    resistor wiring harness was too narrow gauge and fried the resistor etc.
    GM covered 1/2 the cost of the harness and they should have covered it all...
    IF, GM dealer had officially diagnosed the problem...and if you could get a hold of the district sup....he could authorize the repair.
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