72 442 Air Conditioning

Old May 25th, 2019, 08:33 PM
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72 442 Air Conditioning

Hi all
wondering if anyone has some Info on diagnosing an ac system. Any ideas on how to detect leaks? I saw something about using r34 but Iam sticking to r 12
if anyone has has any help that would be great

sorry I just realized I posted this in the wrong section

Last edited by Hdmike444; May 26th, 2019 at 04:23 AM.
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Old May 26th, 2019, 12:06 PM
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Do you have a 72 Oldsmobile CSM Chassis Service Manual? It has detailed schematics, pictures and descriptions of servicing, troubleshooting and rebuilding.
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Old May 26th, 2019, 12:50 PM
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Ordered it but don’t have it yet
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Old June 14th, 2019, 07:18 PM
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Ok so I have determined I need some ac parts, my compressor bearings are toast and probably the source of the leak. Should I buy a new one or have it rebuilt? Also where can I get a seal kit? And I have a fuse? That is gone because the unit ran out of Freon. The three prong in-line one at the compressor, any ideas on where to find that?
Thx in advance
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Old June 14th, 2019, 08:07 PM
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Check Rock Auto.
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Old June 15th, 2019, 07:52 AM
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I found the thermo limiter fuse at NAPA
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Old June 16th, 2019, 10:41 AM
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I recall a thread recommending a modern replacement for the compressor that was lighter and more effiecient, that might require r134 tho.
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Old June 16th, 2019, 02:07 PM
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Having been through this.....

If all of your a/c bits and pieces are original, after the compressor....I'd be concerned about what's behind door #2. 50 year old hoses, condenser and evaporator......gotta wonder if they will hold pressure (and if it does hold pressure, how long will it hold pressure)

To convert or not to convert......r12 is out there and it's not as astronomically expensive as it used to be. IF, and this is a big IF, the only issue you have is a bad compressor......if you rebuild yours, get a rebuilt A6 or even go with a new one like the Pro6Ten....then I'd probably stick with r12.

However, IMO (and your mileage may vary)....if functioning AC is important (and to a fat guy like me, it is) The MAW factor comes into play. If you are already looking at a new compressor, a new drier is in order.....I'd probably, at a minimum, change out the hoses just because 50 year old hoses scare me. Now if you are in for a new compressor, drier and hoses....geeze, I'd probably think about a new condenser (which if you convert to 134 is a must). If you are in that far, a new evaporator and you darn near have an all new system. In which case, I'd probably just replace the POA valve with a cycling switch (or have the POA adjusted) and go with r134.

Anywho, that's what I did. Replaced everything and converted to 134 and I've got bitchin cold air on a hot day. Well worth it, IMO.

Long story short, I think the compressor is probably just the starting point....

Again, YMMV.


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