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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / June 2006AC Compressors Won't Take Charge
I just checked the charge on the A/C compressor of my 93 TranSport, and found it nearly gone. It was fine last fall, and I figured that I'd charge it and check for a leak. I hooked up my gage set, and a bottle of R134, jumped the low-pressure switch, and opened the valves. THe pressure on both sides jumped to about 90 psig (bottle pressure), but the compressor was taking no charge at all from the bottle. The compressor was fine last fall, and it was making no unusual noise, or giving any other sign of failure. Well, I decided to check the system on my 94 Pontiac, and the same durn thing happened. And, yes, all the right valves were open, checked them repeatedly. What's wrong? Larry >I just checked the charge on the A/C compressor of my 93 TranSport, and >found it nearly gone. It was fine last fall, and I figured that I'd >charge it and check for a leak. I hooked up my gage set, and a bottle >of R134, jumped the low-pressure switch, and opened the valves. BOTH high and low side valves? That's your problem, low side only! >THe pressure on both sides jumped to about 90 psig (bottle pressure) Sounds like you opened both -- see above. > but the compressor was taking no charge at all from the bottle. The >compressor was fine last fall, and it was making no unusual noise, or >giving any other sign of failure. Well, I decided to check the system >on my 94 Pontiac, and the same durn thing happened. And, yes, all the >right valves were open, I don't think so! Don www.donsautomotive.com > checked them repeatedly. What's wrong? > > Larry Agreed, both valves? >>I just checked the charge on the A/C compressor of my 93 TranSport, and >>found it nearly gone. It was fine last fall, and I figured that I'd [quoted text clipped - 21 lines] >> >> Larry > >I just checked the charge on the A/C compressor of my 93 TranSport, and > >found it nearly gone. It was fine last fall, and I figured that I'd > >charge it and check for a leak. I hooked up my gage set, and a bottle > >of R134, jumped the low-pressure switch, and opened the valves. > > BOTH high and low side valves? That's your problem, low side only! There's one on the R134 bottle, remember? > >THe pressure on both sides jumped to about 90 psig (bottle pressure) > > Sounds like you opened both -- see above. Nope, line pressure will equalize on both sides of the system with the high valve closed. . And, yes, all the > >right valves were open, > > I don't think so! Well, they were. Larry > ... > Nope, line pressure will equalize on both sides of the system with the > high valve closed. > ... If the high & low are the same when the compressor is running you've got problems, assuming the gauge valves are set correctly (low open, high closed). |
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