I am having a problem with my A/C and I would like some help, maybe I am overlooking something. Truck is a 1996 GMC C1500 with 5.7l.
The high side service port blew out, so I replaced it and vacuumed/recharged the system. After a couple of days the compressor started short cycling, but after about 10 minutes of driving it would stay on. After a couple more days it wouldn't kick on at all. I hooked up my gauges and I still had a charge. The compressor wouldn't kick on by jumping the low pressure switch on the accumulator.
I used this very nice write up and thought I had it narrowed down to the control unit. I ordered another control unit off eBay and system behaves the same. I've checked the A/C fuses and jumpered both pressure switches. The only way I can get the compressor to kick on is by jumping 12v to pin 30 in the relay socket.
Is there anything I may be overlooking? Thanks in advance, I am tired of this Alabama summer.
The high side service port blew out, so I replaced it and vacuumed/recharged the system. After a couple of days the compressor started short cycling, but after about 10 minutes of driving it would stay on. After a couple more days it wouldn't kick on at all. I hooked up my gauges and I still had a charge. The compressor wouldn't kick on by jumping the low pressure switch on the accumulator.
I used this very nice write up and thought I had it narrowed down to the control unit. I ordered another control unit off eBay and system behaves the same. I've checked the A/C fuses and jumpered both pressure switches. The only way I can get the compressor to kick on is by jumping 12v to pin 30 in the relay socket.
Is there anything I may be overlooking? Thanks in advance, I am tired of this Alabama summer.