Question about 1991 GMC Sierra
Is the A/C 134A or R12? There is safety switch in your canister on the passengers side, if it is below the safe level, it will not engage the compressor clutch. Make sure your refill charge is the proper brand, either 134A or R12. One sure way to check if your level is low, remove the connector wire to the canister and place a jump wire across to two, if the compressor clutch engages, your level IS low.
Posted on Oct 15, 2008
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Posted on Jan 02, 2017
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