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Old 07-24-2007, 10:37 AM   #1
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Default A/C Compressor Problem

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? I've also put a test probe from the neg. term. of the battery to the hot line going into the relay and it kicks the compressor on......it would appear I'm not getting a signal to the relay to start the compressor?

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Old 07-24-2007, 11:24 AM   #2
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What year vehicle is it? Depending on the year, your low side pressure may be a touch low to have the system start. What is that pressure when the compressor is not running?
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Old 07-24-2007, 11:27 PM   #3
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1991 Olds 98 Regency------When I jumper the leads and activate the compressor my manifold guages read between 30-35 on the low side and between 190-210 on the high side with an ambient temp. of around 85-90 degrees. That should be more than sufficient to trip the pressure switch to kick the compressor. I've tried 2 different cylcing switches, and I got no reaction from crossing the leads with the ol' paper clip routine (as usual). To get it to run I have to run a jumper from the battery to the leads, or from the battery to the relay (piercing the lt. green/black stripe wire).
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