Question about 1992 GMC Sierra

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Where is the A/C crompressor clutch relay - 1992 GMC Sierra

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Hi, if i remember correctly, you pull out the radio, or the glove box, and right behind that part of the dash is a relay cluster consisting of three relays. the middle one is the a/c clutch relay. it will be mounted on top of the a/c-heater box to a metal bracket.

Posted on Jul 01, 2010

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Posted on Jan 02, 2017

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The relay is under a black plastic cover on the driver's side behind the battery. There are a couple other relays under there.-------I would start by jumping the AC relay to see if the clutch will run, you do this by removing the relay and putting a jumper wire between 30 and 87 terminals, if the clutch runs then check to see if there is power on the 85 terminal at the relay and a ground at terminal 86 if all are good replace the relay. The terminal numbers are located on the bottom of the relay, be sure that terminal 30 has power if the clutch does not run.
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Faulty compressor clutch relay. Check to see if the relay is receiving voltage when the A/C is turned on. Also check the relay wiring and ground connections. If bypassing the relay with a jumper wire or routing battery voltage directly to the compressor clutch makes the A/C work, the relay is probably bad.
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This will solve the problem or point you towards the cause of problem. Thank you for using fixya.

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http://forums.trailvoy.com/showthread.php?t=19604
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