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Old 12-02-2012, 04:18 PM   #21
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Originally Posted by Smartstream View Post
I drive with a pocket thermometer in the vent so I can keep an eye on the A/C. The NOS compressor ran 8 to 10 degrees cooler at the vent with no other changes in the system.

Cheers, Dan
Hi, I used to keep a pocket thermometer in the vents of all of my cars; I don't anymore, but I have two of the larger ones in my trailer. I have one in my refrigerator and the other in my air conditioner.
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Old 12-02-2012, 10:21 PM   #22
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I want to clarify that the R12A I mentioned in my post above is NOT the same as R12.

R12 is the original Ozone depleting refrigerant invented in the 1930's and used in Auto refrigeration systems until 1994.

R12A is a propane based refrigerant which is a very good drop in replacement, but it is flammable and thus not used as an OEM refrigerant due to the scare of a fire hazard. I understand that in Germany it is used on cars from the factory sold in Germany, so it can't be too much of a problem. However I am only pointing out that it does exist, and is sold and used a lot by individuals. The GMC motorhome forum group swears by it. I have used it personally. It is inexpensive and has better cooling properties than R12.

I am not going to debate the merits of it one way or the other, just letting you know it does exist, and you can find it with some Google searching.
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Old 12-02-2012, 10:30 PM   #23
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I got ya Robert...
I have some small cans of R12 floats about too!
And some ES12a...
Here is some virgin R12...
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Old 12-03-2012, 07:36 AM   #24
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Do what you will with the R12A, but in my professional capacity, I must say that GM does not approve, due to its flamability.

If you do go to 134A, before you replace the condenser, I would look into installing some electric cooling fans. A good choice would be those complete sets available for police applications. They were designed for long idle times specifically to reduce underhood temps AND improve A/C performance while at investigation scenes for hours at a time.

The Impala PPV (9C1 option code) has a setup with a 320 watt (IIRC) fan set that is very good.

This suggestion probably cost no less than a bigger condenser, but may be easier to find, and cures several thermal issues at one time. It could be switched in a vareity of manners, depending on what you want.

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Old 12-13-2012, 05:34 AM   #25
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If your compressor is bad make sure you clean all the debris out of the high pressure line and condenser. An 02 model should have been 134a. Federal law was any vehicle made after 92 be 134a. Anyway if it was made to run 12 then it will run best on 12 gas, there are a few replacements now out that are a drop in gas like the r12a and there are others. But 80 a lb is way to much. Before long 12 systems will be gone and 12 worthless. I would use either 12 or one of the replacements and not 134a, that is if the a/c was designed to run with 12. Make sure you clean the whole system out and replace the oil that is compatible with whatever refrigerant you decide to use.
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Old 12-13-2012, 08:20 PM   #26
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Update on dash AC

My P30 is a 1979 with a 1981 coach. It came with R12. I received a brand new compressor and got new R12 fittings among other things to replace the hack job R134a conversion the PO had someone do for him.
It blows way colder than the 134 ever did.
If I ever need charging after the one year warranty expires, I definitely will use the R12a or equivalent. I just wanted to use R12 just this once to know how it's supposed to feel, kind of like a baseline.
The heater and AC fans and switches all work well!
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