No lights at HVAC control module?

Tiny
JOE SCHEELE
  • MEMBER
  • 2004 CHEVROLET SILVERADO
  • 6.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 105,000 MILES
I have the truck listed above diesel. I've replaced compressor, accumulator as well as a h/p line. Old components worked but compressor has a body leak and as well as h/p line. Replaced sucked down went to start and no power to compressor. Checked fuses and relays all seem to be working and in good shape. Went to module checking power and lost lights to module. I did some more checking with for power and decided the module was bad. Replaced module and still no lights or compressor? I'm not sure where to go from this point. Any help would be greatly appreciated. Thanks in advance.
Wednesday, May 3rd, 2023 AT 2:58 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,490 POSTS
I would re-check the fuses for power this guide can help, and I have included the HVAC and A/C compressor wiring diagrams so you can see which fuses to check, please unplug the A/C compressor before testing, the engagement coil might be shorted causing the issue.

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

The fuses are at the top of the first and last diagrams. Check out the images (below). Please let us know what happens.
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Wednesday, May 3rd, 2023 AT 4:31 PM

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