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A/C clutch will not engage?

Tiny
VBOTICS
  • MEMBER
  • 2000 CHEVROLET SUBURBAN
  • 5.2L
  • V8
  • 4WD
  • AUTOMATIC
  • 300,000 MILES
A/C compressor locked up, burnt off belt. Replaced A/C compressor, belt, pulley, high and low pressure switches, actuators on interior cab. Jump pins on relay and ac clutch activates. Also replaced interior HVAC control panel. Out of options other than tracing blue wire from relay to control panel. Seems like the relay just isn't getting the signal to turn on. Also, when manually trigging compressor the low sideline seems to frost up, but never blows cold inside cabin.
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Monday, September 2nd, 2024 AT 3:07 AM

8 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,397 POSTS
Does the compressor run if you jump the low-pressure switch? The blk and drk grn wires? Here is the location of the pressure sensor and the wiring diagrams for the compressor circuit so you can see how it works. Please go over this guide as well:

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with.
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Monday, September 2nd, 2024 AT 11:53 AM
Tiny
VBOTICS
  • MEMBER
  • 5 POSTS
Negative, no change when jumping low pressure switch.
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Friday, September 6th, 2024 AT 9:31 PM
Tiny
VBOTICS
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  • 5 POSTS
The low side is at 35 psi and the high is at 225 psi when I jump the relay.
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Friday, September 6th, 2024 AT 9:32 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,397 POSTS
Can you please check the IGN1 fuse for power and make sure the fuse has power?

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

Also, did you swap out the AC relay? Also, there are high pressure switches on the back of the AC compressor that can be jumped which if the compressor comes on the high pressure switch needs to be replaced. Check out the images (below). Let us know how it goes

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Saturday, September 7th, 2024 AT 7:27 AM
Tiny
VBOTICS
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  • 5 POSTS
I swapped out the relay with the horn relay that I know works, no change. I will double check the fuse.
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Saturday, September 7th, 2024 AT 10:54 PM
Tiny
KEN L
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  • 48,397 POSTS
Yep, see if there is power at the fuse as well.
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Sunday, September 8th, 2024 AT 11:13 AM
Tiny
VBOTICS
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  • 5 POSTS
Omg, the fuse was fine, bypassed the high pressure switch and it works! Problem found! Hooray! Thank you sooo much, I figured a view from outside would help.
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Sunday, September 8th, 2024 AT 3:30 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,397 POSTS
Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.
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Monday, September 9th, 2024 AT 8:06 AM

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