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Old 01-09-09, 07:47 AM
chubbyranger chubbyranger is offline
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Cadillac(s): 99 Z-rated STS, 90 Coupe Deville (sold)
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Re: 91 deville ac problem

Quote:
Originally Posted by bklynsoulja View Post
how hard is to replace my condenser? and everytime i turn on my a/c i hear a big motor sounds and also i feel my car shaking or vibrating as i turn it on, if i turn it off it gone what can that mean? i was thinking blower motor but i dont know anymore any thoughts?
Between this symptom and the rough idle it may be time to check the ISC motor. Does the shake/vibration caused by the AC only happen at idle? If so your ISC may not be compensating for the extra compressor load, although with a load of R-134 in an R-12 system its a tough call. I'd turn the ISC adjuster out a couple turns and see if anything changes.