HVAC Controls Malfunction - Stays on full heat
02-03-2006, 09:59 PM
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HVAC Controls Malfunction - Stays on full heat
I've had and intermittent problem with the HVAC controls that is now happening almost daily. . . If I start out with the truck on heat (cold mornings), then switch to cold vent, the HVAC continue to blow hot air. . . with the temp **** on full cold, and the flow control on vent or any other positions.
Usually if I turn the engine off, and restart, it is OK again. Has anyone else had to deal with this one? What is the fix?
Usually if I turn the engine off, and restart, it is OK again. Has anyone else had to deal with this one? What is the fix?
02-03-2006, 11:25 PM
#2
Originally Posted by Rado01
I've had and intermittent problem with the HVAC controls that is now happening almost daily. . . If I start out with the truck on heat (cold mornings), then switch to cold vent, the HVAC continue to blow hot air. . . with the temp **** on full cold, and the flow control on vent or any other positions.
Usually if I turn the engine off, and restart, it is OK again. Has anyone else had to deal with this one? What is the fix?
Usually if I turn the engine off, and restart, it is OK again. Has anyone else had to deal with this one? What is the fix?
02-04-2006, 09:27 AM
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Had that **** happen to my 04 GMC Sierra when I had it. It sucks and trust me, it will be a recurrring nightmare. The dealership changed out what they call an a/c recirculating switch or relay. I think thats what it was, I will have to check my serivce documents. Mine went out and they replaced it and then about every month it would go out again.
02-04-2006, 10:28 PM
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Originally Posted by L33Z71
Oh, went back and checked my records. They called it an a/c cycling switch.
Anyone else? On my 01 Silverado, It will blow highly heated air when just on vent, so I'm not sure its related to the a/c cycling switch. I'll have to look that one up in my manuals.
Last edited by Rado01; 02-04-2006 at 10:35 PM.
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02-05-2006, 01:13 AM
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Happened on my truck when I pulled and replaced the engine. I found a ground strap on the back of the engine block which I forgot to replace. I suggest you make sure the block, body, frame, and battery are all strapped together for a good ground.
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