2000 S-10 AC power

Tiny
CMWALTER
  • MEMBER
  • 2000 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 131,000 MILES
2000 s-10 ac compressor will not run. Put power on the relay and the compressor will run. Have a power to the relay and a switched power to the relay(working off the ac switch inside). Don't know what the forth relay tab is supose to have(ground maybe?)I've tried ground and power and got nothing.I've switched relays to no avail. Any help would be greatly appreciated. Would the low pressure switch keep it out? If so, where is it? I'velook from the compressor to the firewall on the low pressure line and dryer can and its not there.
Wednesday, August 17th, 2011 AT 3:51 AM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You need to be real careful there. One of those terminals is connected to the PCM because the PCM is what controls that relay and you can easily fry the PCM by prodding around the wrong way. There could be any number of reasons that the PCM is not turning the compressor on. It monitors a few things to make that decision.
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Wednesday, August 17th, 2011 AT 10:41 AM

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