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Old 03-11-2017, 09:29 AM   #1
71chevmal
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2004 weird heat issue

I have front and rear climate control. Digital control up front, rotary knobs above for rear.

In the front, I have heat, but no fan and in the rear I have fan but no heat.

I'm really scratching my head on this one. Any help would be appreciated.
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2004 Yukon. 5.3L 176k+ mi
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Old 03-13-2017, 10:42 AM   #2
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Re: 2004 weird heat issue

Are you hearing any clicking under the dash towards the passenger side?
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Old 03-13-2017, 12:39 PM   #3
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Re: 2004 weird heat issue

I have a 05 Deville that had the same issue. it was the valve switch.
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Old 04-26-2017, 06:10 PM   #4
71chevmal
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Re: 2004 weird heat issue

It was the module in the duct again. Normally it fails closed but this time it was open. I'm averaging one of these modules a year. Anyone got a solution?
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Old 04-27-2017, 01:00 AM   #5
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Re: 2004 weird heat issue

Sounds like it has a crappy ground through the digital control and is shorting out. Instead of using the provided ground through the harness I would ground it directly to the body of the vehicle.
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Old 06-11-2017, 09:18 AM   #6
71chevmal
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Re: 2004 weird heat issue

Thanks. I replaced it in April and it's dead again. I may have to reverse engineer my own solution.
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Old 06-16-2017, 09:44 AM   #7
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Re: 2004 weird heat issue

Quote:
Originally Posted by 71chevmal View Post
It was the module in the duct again. Normally it fails closed but this time it was open. I'm averaging one of these modules a year. Anyone got a solution?
I replaced that actuator in my 2005 Yukon with one from Dorman about two years ago. We had gone 2 years with it switched into the AC mode and then I disconnected the harness to keep it there.

"Loved" that I had to grind down my 5.5mm socket shorter at both ends for access, and the @$^%&*#@$^&*$# hump was still in the way !!! Other type of fasteners would've been easy to do.
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