Mechanics

A/C COMPRESSOR PROBLEM

GMC C1500

I have a 93 chevy silverado. Z 71 1500, 5.7L. Recently I turned on the defrost, and at idle the truck began to have a rough idle to the point of almost stalling. I looked under the hood, and when the a/c, or the defrost is engaged, and the a.C compressor is active, it malfunctions. The clutch on the front of the compressor works fine for the first few seconds, but then it engages and disengages continuously, causing my truck to idle very hard, and the a.C and defrost to be unworkable. What is my problem, and what can I do?
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NCTarheelfan220
April 11, 2006.



First off unplug the electrical connection to the compressor. Run your truck to see if the problem goes away or not. If it goes away, your issue is with the internal wiring of the compressor itself.
Good luck, please post a reply if you get things worked out.

Tiny
Kenvcr
Apr 13, 2006.
I did what you suggested today, and unplugged the compressor. The problem went away, because the compressor wasn't active. The problem only arises when the clutch on the pulley of the compressor is engaged, or supposed to be engaged. When turning on the a/c, the clutch engages fine, but pops out after a short time. It will re-engage, but very soon after the clutch seems to pop out, sputter, and lock up. Are there any sensors or wires which could be confusing the compressor? If not, what would my problem be?

Tiny
NCTarheelfan220
Apr 13, 2006.
Sorry for the late reply, went to reno on long weekend.
OK The clutch portion on the compressor works like your cooling clutch fan. They do wear out/foul up.
Unfortunately it sounds like you need to rebuild or replace the compressor.
You can leave it unpulgged without any consequences to the engine performance.
Kenvcr

Tiny
Kenvcr
Apr 19, 2006.