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08-27-2003, 12:53 AM
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GM Air Conditioner compressor
Are most GM air conditioner compressors the same on the older engines? Mine has been painted so I can't read the numbers or who it's made by?
 Regards Mark 
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08-27-2003, 03:37 AM
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other than in newer cars, i don't remember ever seeing a diffrent one, they all look the same. ...mike
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08-27-2003, 05:24 AM
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There are 2 different sizes, I belive in length only. Around the early 80s. What year are you talking about?
__________________
Luv the smell of NITRO in the morning.
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08-27-2003, 12:54 PM
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Well in the early 70s and older, they used radial style compressors. So they are different for the period of time.
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08-27-2003, 01:25 PM
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OK well here is what I know, the block in my Jag is a 400 4 bolt from around 1976. It's got a Performer intake and Qjet. So let's assume it's mid 70's to early 80's. The compressor is cylindrical in shape with 2 stainless tubes running from it. The fittings look to have been hacked off and the hoses held on by hose clamps (this will change with the new compressor). I would like to convert over to R-134 since freon is out of site right now. Can the stock compressor handle R-134 or should I opt for a newer model?
I've been told that the only thing I need to change is the dryer assm. but I want to make sure before I dive into this head first. I was thinking of buying a rebuilt from Track or Kragen any opinion on that? Regards Mark
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08-27-2003, 01:33 PM
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I switched over to r-134 in a Nissan pickup, never changed anything. Put adaptors on the fittings, sucked it down, refilled with the 134 and it worked great.
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08-27-2003, 01:55 PM
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You most likely have a Harrison model AL-6, that's a very good compressor. It'll take anything you can throw at it.....
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08-28-2003, 02:06 AM
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08-28-2003, 09:32 AM
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.....I mean A6...
 Upside down huh, I'll bet that's for high performance applications. 
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08-29-2003, 08:53 AM
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oil
I would use ester oil in the install of r134 as the mineral oil used with r12 doesn't like to disburse with r134. The mineral oil lays in a low place in the system and just stays out of the way. This is what I've learned from several a/c sites. FYI
Jesse
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08-29-2003, 09:17 AM
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Thanks Jimfulco for the link, after looking at the car and then the photos on the link I have an R4 I think, the hoses off the back are missing in the photo. Any problem using that compressor with R-134?
Thanks Mark
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08-29-2003, 10:47 PM
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Can't say for sure. I've only had one car with an R4, & they ate themselves up too often for me. The longest-lasting one I had was a used one from a junkyard, & it lasted a year and a half. A rebuilt one prior to that lasted barely long enough for the printing on the receipt to fade away so bad the warranty disappeared.
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08-30-2003, 12:02 AM
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So if the R4 is not a good one can I swap out a better one? Could I put a A6 in it's place?
Regards Mark
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08-31-2003, 02:52 AM
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A6's are prone to lasting forever, but they suck up horsepower like nobody's business. That's why they started using the R4, less drain. The A6's were used from the dark ages until the late 70's or early 80's, so bracketry shouldn't be hard to find. I'm wanting to mount a small Sanden compressor where my A6 currently lives if I can. They don't use much power, and they only cost ~$200 new.
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08-31-2003, 09:47 AM
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That sound like a good option, I'll have to look into that. Is the mounting the same?
Regards Mark
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