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Curious run away heater and solution

Curious run away heater and solution

Postby jonnycando [OP] » Mar 24 2020, 1:18am

I was sitting in a parking lot waiting for whatever. I had the heat on with the AC to better dial in a desirable temperature. After some minutes the dash vents began to blow uncomfortably hot, and no adjustment would change it. Taking a chance I just turned the whole thing off; blower, a/c compressor etc. After a minute or so I turned it all back on and voila! All had returned to normal. I for whatever good it might do now turn all climate controls to off as I shut down the vehicle.
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Re: Curious run away heater and solution

Postby 19trax9519trax95 is online! » Mar 24 2020, 3:29am

Was it in auto mode?
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Re: Curious run away heater and solution

Postby jham0077 » Mar 24 2020, 3:36am

We got a Durango that use to do that. It would blow hot then blow nothing. The ac was freezing up. I could turn the ac off and the blower wide open and it would start coming out the vents, freezing cold for a few minutes. Condensation would pour out of the drain. Some months to a year later, the compressor clutch crapped out and I replaced it and the other required components, had a shop pull a vacuum and recharge it and still had problems with it. It was only on the automatic settings though. I could manually set temp and blower and not have an issue.
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Re: Curious run away heater and solution

Postby jonnycando [OP] » Mar 24 2020, 3:38am

Ah freeze up.... under the conditions of the day it coulda been that and the system trying to thaw it out!
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Re: Curious run away heater and solution

Postby jonnycando [OP] » Nov 12 2020, 3:00am

It took me a while to really dig into this and I found the mode selection motor was wonky...initially you could set a temperature you liked, but it would eventually migrate to full hot and get stuck there. I ordered a cheap replacement and it's plug in pins were offset so that the plug could not go on properly!....so then ordered genuine GM part and poof...it now works properly and I am not longer roasting turkeys with the air outlets.
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