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A/C Compressor will not turn on

Tiny
CSUNDE1953
  • MEMBER
  • 2004 GMC ENVOY
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 175,000 MILES
Installed new compressor charge system but AC clutch won’t engage.
Sunday, May 15th, 2022 AT 3:12 AM

12 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,928 POSTS
There is a fuse #30 (10 amp) in the under-hood fuse panel let's check it for power. here is a guide to help and the fuse location along with the wiring diagrams for the A/C compressor so you can see how the system works:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Monday, May 16th, 2022 AT 9:33 AM
Tiny
CSUNDE1953
  • MEMBER
  • 13 POSTS
I just checked all the fuses, and they are good, then they unplugged the relay plugged it back in and I felt a click, I looked down at the compressor pulley and it is running but very slowly.
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Tuesday, May 17th, 2022 AT 3:09 PM
Tiny
CSUNDE1953
  • MEMBER
  • 13 POSTS
When I unplugged the relay, the compressor completely stops.
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Tuesday, May 17th, 2022 AT 3:10 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,928 POSTS
Okay, so lets pull the plug on the compressor and measure the voltage to the compressor with the system on it should be 12 volts. One wire will have no voltage. This guide can help you with the test.

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Please run down this guide and report back.

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Tuesday, May 17th, 2022 AT 5:15 PM
Tiny
CSUNDE1953
  • MEMBER
  • 13 POSTS
Okay, here’s an update: I check the voltage on the plug at the compressor dark green wire has 14 V the light green wire has 1.12 V.
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Wednesday, May 18th, 2022 AT 6:24 AM
Tiny
CSUNDE1953
  • MEMBER
  • 13 POSTS
That's with the engine running.
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Wednesday, May 18th, 2022 AT 6:24 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,928 POSTS
Good job. Now let's check the ground circuit (black wire). It is connected to the body near the fuse panel. You can do an OHMs check. If this is okay, you got a bad compressor. Can I ask which brand the compressor is?
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Wednesday, May 18th, 2022 AT 11:30 AM
Tiny
CSUNDE1953
  • MEMBER
  • 13 POSTS
It is a RYC remanufactured compressor.
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Wednesday, May 18th, 2022 AT 11:40 AM
Tiny
CSUNDE1953
  • MEMBER
  • 13 POSTS
Is the third wire on that compressor connector the ground the black wire.
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Wednesday, May 18th, 2022 AT 12:31 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Yes, it is, I would have used an AC Delco compressor. The quality of some rebuilds are questionable.
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Thursday, May 19th, 2022 AT 10:14 AM
Tiny
CSUNDE1953
  • MEMBER
  • 13 POSTS
Lesson learned. I just want to say thank you very much for all your help.
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Thursday, May 19th, 2022 AT 7:08 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,928 POSTS
Good to hear, please use 2CarPros anytime we are here to help.
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Friday, May 20th, 2022 AT 7:19 PM

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