AC Help Again Please (91 Olds Regency)??? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-23-2007, 10:57 PM   #1
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Default AC Help Again Please (91 Olds Regency)???

AC cooling moderatly on the Hwy, not at all on surface streets. Pulled Orafice tube and it was clogged, pulled compressor and it was bearly providing any compression or suction. Got another compressor, condensor, orafice tube, accumulator.....flushed hoses, then vac'd the lines at -27 hg for an hour. Refilled w/ 134A and happily switched the system on.........nothing....compressor was not turning. Replaced the cycling switch on the accumulator....nothing. Pulled wires to cycling switch and shorted them with the ol' paper clip trick....nothing. Then clipped my test light to the positive of the battery and pierced the wires to the cycling switch and WA-LA! Everything kicked in and ran great. I had low pressure at @ 30-35 and high pressure @ 200; vent temp blew down to 40 degrees.....ah, felt good.....BUT when the probe is disconnected....it all goes off again. I shorted the pressure switch wires in the back of the compressor.....and also the high pressure cut out switch......that kicked the fans in as it should....still no compressor. When I have the cyling switch shorted out to the battery it shows "AC Requested" on my AutoXray 6000.....and goes off when disconnected. What'* up here? Bad dash module? ECM? IT was working fine before I did this work with the old stuff....just not cooling well..........Did I make a mistake....What else should I look for?

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Old 07-24-2007, 08:45 AM   #2
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Did you convert over to 134A?
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Old 07-24-2007, 09:03 AM   #3
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Yes, it'* been 134A for many years now.
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Old 07-25-2007, 01:41 PM   #4
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On my '91 88 Royale, there is a relay in the relay center under the hood that I had to replace twice already. This relay is what energizes the compressor clutch circuit. You may want to look at that on your car.
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Old 07-25-2007, 02:44 PM   #5
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Thanks. I swapped the horn relay with the compressor relay....they are the same and sit right next to each other. Still no luck. I have no signal to the cycling switch, and if I jumper a wire from the + on the battery and touch it to the light blue wire on the cycling connector, it kicks in...runs fine and blows down to 40 degrees.
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Old 07-28-2007, 12:29 AM   #6
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Stangest thing....went to leave this morning, started car.....A/C Compressor sprung to life, worked all day, temp at the vents blew down to 38-40 degrees. I'm assuming it'* just a wiring issue....I hope I can find the problem or that it won't return....Because there was not juice at the Cycling Switch connector, I assume it was a ground short.
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