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

Tiny
REDHULK
  • MEMBER
  • 2008 GMC ENVOY
  • 6 CYL
  • 160,000 MILES
Seems to be running fine but the A/C suddenly stopped blowing cold and the temperature gauge dropped.
Thursday, September 19th, 2019 AT 10:07 PM

8 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
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Friday, September 20th, 2019 AT 4:28 AM
Tiny
REDHULK
  • MEMBER
  • 3 POSTS
Didn't address the issue?
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Monday, September 23rd, 2019 AT 7:21 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I do not understand what you mean? Please explain?

Roy
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Tuesday, September 24th, 2019 AT 12:17 PM
Tiny
REDHULK
  • MEMBER
  • 3 POSTS
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.
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Tuesday, September 24th, 2019 AT 1:03 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I was addressing the temperature gauge first as that will effect the A/C operation.

Roy
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Tuesday, September 24th, 2019 AT 2:47 PM
Tiny
REDHULK
  • MEMBER
  • 3 POSTS
Oh, okay then.
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Tuesday, September 24th, 2019 AT 7:54 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Let me know what you find. The 2 are connected.

Roy
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Tuesday, September 24th, 2019 AT 7:59 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
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.
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Wednesday, September 25th, 2019 AT 10:09 AM

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