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So AC thread I have a dilemma... Vehicle is a 2001 GMC yukon with rear AC controls. Ac doesn’t work. Compressor doesn’t come on. Previous owner says he had it diagnosed as a clutch. It still has lots of refrigerant in the system, i hooked up my gauges and when I released them a lot came out from a sticky old Schrader valve which I replaced. Relays and fuses are good, and jumping across the low pressure switch does nothing. My choices are replace the clutch, I think I have a small 3 jaw puller that will work, and O’Reilly has the part for $140 or rock auto for $110. This is assuming the compressor still turns which because of its location I can’t verify. Or I can buy a complete compressor kit for like $180 with all the trimmings like a new receiver dryer and a poo poo ton of o rings and new oil. I have a beat up vacuum pump my wife uses for her milking machine and a set of gauges that measure vacuum but not in microns. I think I could do it either way. Its just a question of which way is the right way. New clutch on an old compressor or new compressor of cheapest quality. What do you guys think?
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Jul 28, 2019 03:49
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| # ¿ Apr 26, 2024 21:43 |
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Motronic posted:Have you found the compressor clutch relay and tried to bridge it yet to see if it's actually a clutch that doesn't work? That would be my step 1. I will give that a shot. I did swap relays around and put the DRL relay in the AC spot (DRLs worked and still do), but I did not jump any pins or probe for power. I was debating smacking the clutch with a hammer but its not in a good location, nor is it my vehicle.
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Jul 28, 2019 04:07
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It was probably R12 and had a big round GM harrison compressor. Those things were pressed together with some big orings and were responsible for a large number of leaks. If I were doing it I would replace the condenser, flush the evaporator and lines, replace the orifice tube, replace the receiver dryer and find a rebuilt compressor. At this point assuming it holds good vacuum I would recharge with R12 and the correct oil. R12 systems tend to underperform when retrofitted to 134a and your in California where I assume it gets hot.
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Jul 29, 2019 03:29
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