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Chevy Silverado and GMC Sierra Climate Control

241 messages, Last post on Nov 23, 2009 at 6:24 PM

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What is this discussion about? Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Heating / Cooling, Truck

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#210 of 241 Re: 2004 Hvac Dual Climate hot one side cold the other [jimm10] by ply1977 Apr 16, 2009 (5:03 pm)
Replying to: jimm10 (Apr 16, 2009 4:15 pm) 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. Patrick Replies to this message: jimm10 (Apr 17, 2009 6:19 pm)
#211 of 241 Re: 2004 Hvac Dual Climate hot one side cold the other [ply1977] by jimm10 Apr 17, 2009 (6:19 pm)
Replying to: ply1977 (Apr 16, 2009 5:03 pm) 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.
#212 of 241 Re: 2003 silverado a/c [canam2] by jimm10 Apr 17, 2009 (6:38 pm)
Replying to: canam2 (May 22, 2008 5:11 pm) 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.
#213 of 241 2004 Chevy 1500 Climate Control by seivers Apr 22, 2009 (9:16 am)
">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? Replies to this message: jimm10 (Apr 24, 2009 6:15 pm)
#214 of 241 Re: 2004 Chevy 1500 Climate Control [seivers] by jimm10 Apr 24, 2009 (6:15 pm)
Replying to: seivers (Apr 22, 2009 9:16 am) 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.
#215 of 241 Heater airflow controls not working by orgrabbit May 24, 2009 (1:29 pm)
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?
#216 of 241 95 Chevy K1500 Blower Problems by anthony76112 Jun 10, 2009 (6:13 am)
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 ! Replies to this message: obyone (Jun 10, 2009 3:24 pm) anthony76112 (Jun 11, 2009 3:26 am)
#217 of 241 Re: 95 Chevy K1500 Blower Problems [anthony76112] by obyone Jun 10, 2009 (3:24 pm)
Replying to: anthony76112 (Jun 10, 2009 6:13 am) probably a diode located in the switch itself Replies to this message: anthony76112 (Jun 11, 2009 3:26 am)
#218 of 241 Re: 95 Chevy K1500 Blower Problems [obyone] by anthony76112 Jun 11, 2009 (3:26 am)
Replying to: obyone (Jun 10, 2009 3:24 pm) I replaced the entire switch panel and it still does the same thing.
#219 of 241 99 GMC Sierra A/C Blows hot by nashcat Jun 14, 2009 (6:55 am)
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? Replies to this message: obyone (Jun 14, 2009 12:26 pm)

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