Check for 12v on both sides of the low pressure switch on AC drier. Very common failure. And it maybe obvious, but also check that you have enough charge to close the switch.
Check for 12v on both sides of the low pressure switch on AC drier. Very common failure. And it maybe obvious, but also check that you have enough charge to close the switch.
89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
05 Outback XT 2.5L turbo gas auto
Thanks to both of you. Unfortunately I have a leak, at or near the condenser. I bought one of the parts store bottles with the gauge. Zero pressure initially and put some in and quickly figured out there's a leak in the line that goes from compressor to condenser, but it's behind the radiator so I couldn't pinpoint it exactly. Putting pressure on that hose can change the leak rate so I'm assuming it's where the inlet tube is brazed to the condenser body. I tightened the connection between the line and the tube just to be sure that wasn't the problem. I will have to pull the radiator to figure it out exactly. And then I couldn't get enough pressure in the system to verify if the low-side switch is working. I had engine running with A/C selected - compressor never came on even though I could get pressure close to the green section on the gauge, but not quite.
Here at work I've rigged up a fitting to use regulated shop air with my A/C gauges to pressurize the system to find gross leaks with soapy water. Small leaks are easiest to spot with A/C dye and black light. Most leaks are usually accompanied with A/C oil too, another helpful hint.
89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
05 Outback XT 2.5L turbo gas auto
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