A/C stopped blowing cold and the temperature gauge went to zero

2008 GMC ENVOY
160,000 MILES • 6 CYL
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REDHULK
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Seems to be running fine but the A/C suddenly stopped blowing cold and the temperature gauge dropped.
Sep 19, 2019 at 10:07 PM
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ASEMASTER6371
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Good morning,

I attached a wiring diagram for you to view. Check the fuses I circled for power on both sides with the key on. This is not a visual inspection, it is a voltage check on both sides of the fuse.

As far as the temperature sender, it could be a bad sender unit. Check the sender for power with the key on.

Roy
Sep 20, 2019 at 4:28 AM
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REDHULK
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didn't address the issue?
Sep 23, 2019 at 7:21 PM
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ASEMASTER6371
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I do not understand what you mean? Please explain?

Roy
Sep 24, 2019 at 12:17 PM
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REDHULK
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Okay, so as i said the A/C quit blowing cold at the same time the temperature hand dropped to C. I drove the truck 10 miles home the next morning i drove about a mile and the temperature hand went from C to NORM then the AC started cooling again.
Sep 24, 2019 at 1:03 PM
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ASEMASTER6371
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I was addressing the temperature gauge first as that will effect the A/C operation.

Roy
Sep 24, 2019 at 2:47 PM
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REDHULK
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Oh, okay then.
Sep 24, 2019 at 7:54 PM
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ASEMASTER6371
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Let me know what you find. The 2 are connected.

Roy
Sep 24, 2019 at 7:59 PM
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STRAILER
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The PCM ties these systems together I would do a CAN scan toy see what comes up you may have a bad PCM. Here is a video. You can get a CAN scanner from amazon for about $45.00:

https://youtu.be/InIlnsjOVFA

Please run down this guide and report back.
Sep 25, 2019 at 10:09 AM