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The A/C compressor refuses to start, while my fan continues to run

Tiny
MBOZE17
  • MEMBER
  • 2018 CHEVROLET COLORADO
  • V6
  • 2WD
  • AUTOMATIC
  • 112,000 MILES
This causes my ac to blow hot air. I have replaced fuses, replaced ac pressure switch, and Freon levels are good. The funny thing is I can restart my battery and the A/C will work perfect for about 12-24 hours. Can you help me with diagnosing this issue?
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Sunday, June 26th, 2022 AT 8:12 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,895 POSTS
It sounds like the HAC control module is no good. To be sure we can do a CAN scan which is in this guide and video. I have included how to change the HVAC module out and the A/C wiring diagrams so you can see how the system works.

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Monday, June 27th, 2022 AT 9:31 AM

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