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Pickups Chevrolet Silverado & GMC Sierra Chevy Silverado and GMC Sierra Climate Control
241 messages, Last post on Nov 23, 2009 at 6:24 PM
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I recently bought a 1996 GMC Sierra 1500 with 240k that runs great, but needs a little work. One issue I am trying to solve is that the vents only work on defrost. I don't hear anything when I switch it to the front vents or any other setting. What could this be caused by? Is it the AC control head or something else under the dash? More importantly, I have no heat or AC coming out of the defrost vents. Where should I start to diagnose this problem? Any leads or direction would be much appreciated. The Chilton's/Haynes manuals offer no guidance here.
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Replying to: firestine (Jun 23, 2007 5:34 am) On the other issue, the hoses leading into the firewall and the heater box are hot, leading me to believe that the problem may be with a blend door. I saw another actuator behind the dashboard on the passenger side. Does this actuator control a door allowing air to enter the heater box? Could the actuator be bad or could something be blocking the door? Any ideas are greatly appreciated. I'd like to know what I'm getting into when I tear the sucker apart. Thanks! |
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| Help, I have a 2004 4.8, and while driving(hot or cold) the air turns to heat and nothing will stop it until the engine restarts. This is happenning almost daily now, which is bad since it is summer. | |
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Replying to: 200448 (Jul 04, 2007 11:46 am)
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can anyone offer a solution to a knocking sound coming from a vent at the bottom of my heater box? It happens every time I turn the ignition on or off and when I turn on the A/C.
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Ok... I wish I could add a solution to some of your problems on here... but I can't, so I'll just add my own problem... I have a 2000 GMC Sierra 1500, 5.3 extended cab. About a month ago I noticed that the AC would only blow cold air at higher speeds, above 40 mph. I recharged the system, that didn't help any. Now yesterday, of all days (it's hit 90 degrees here in MA yesterday), it starts to blow hot air all the time. I see some similar problems on this thread, has anyone come close to finding a fix for this... ????? Just a thought, as I know alot of dealerships will probably say "we will have to see it before we can tell you what's wrong with it", but has anyone tried asking a dealership about this problem..? Thanks for your advice and suggestions, Tony...
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Replying to: trogers1029 (Jul 26, 2007 6:49 am) |
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| My ac stopped working properly. 1-4 on the control panel work fine, but when i turn the knob to 5 it shuts off. Its like i might as well of turned it off. When i turn it back to 4 or lower it works fine. Whats going on? | |
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Replying to: natedog172 (Aug 08, 2007 5:17 pm)
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Replying to: obyone (Aug 08, 2007 8:39 pm)
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