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GMC Forum: A/C Compressor Clutch Not Engaging
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Old 06-17-2018, 05:42 PM
rs1sensen rs1sensen is offline
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Join Date: Jun 2018
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Default A/C Compressor Clutch Not Engaging

Hey guys,
I’m hoping you can help. I have a 2000 GMC Jimmy SLT.

My AC hasn’t been working for some time, but with the hot summer temperatures hitting me in Florida I decided it was time to get it going.

The system was entirely out of freon so I put a light charge in and then used a leak detector, where I diagnosed that the compressor was leaking substantially.

I then proceeded to replace the compressor, condenser, orifice tube and accumulator. I also flushed all the lines and the evaporator.

I noticed that the wires on the back of the high pressure sensor located behind the compressor were pretty frayed and had some corrosion on them. I bought a new connector, cut off the freyed wires, and then spliced the new connector wires to them.

I pulled a vacuum for 40 minutes to remove air/moisture from the system. I then let the vehicle sit for another 45 minutes, and it held the vacuum the entire time. I proceeded to re-charge with 28oz of r134a.

During charging, the compressor clutch turned on and off repeatedly. However, at the end of the charge, the clutch would not turn on at all.

I jumpered the clutch at the relay and the clutch would come on when jumpered. I then proceeded to replace the pressure switch at the accumulator, but that didn’t make a difference.

I also tried swapping the relay with the horn relay, and also no difference. I took a look at the fuses and they looked OK. I also verified that the AC controls were on full blast with the AC light illuminated inside.

Any ideas/next steps? Photo of my gauges taken when the relay was jumpered are attached. Temperature outside today is 86 degrees.

I appreciate your help!
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Last edited by rs1sensen; 06-17-2018 at 05:53 PM.
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Old 06-18-2018, 08:21 PM
rs1sensen rs1sensen is offline
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Drives a GMC Truck
Join Date: Jun 2018
Posts: 2

Ended up solving this one. I replaced the high pressure sensor on the back of the compressor and am now good to go!
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