Quote:
Originally Posted by pmax
I would think the process is the same as any other R134a system. Evacuate and fill with the correct amount of freon and oil.
Or is it one of those shops with a stash of or knows where to get some R12 for classic cars  ?
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The big difference is most other cars have all the AC components in the engine compartment, and all close together. With the 27 feet of hoses, and 4 condensers, evaporator, and other various parts, water (ice) has a lot of places to hide.
It is physically impossible to have to good of a vacuum. And water will freeze into ice and "hide" in the system in a typical 10 minute vacuum pull.
At least one nitrogen purge is a very wise move. Just my opinion, and I am not an AC pro, just a dude with some kick butt AC in my 85 911.

That is frost on the connection coming back to the compressor on a 80 degree day.

I was 100% comfortable in my car on a toasty day in southern New Mexico. After an hour of driving, I have to turn the temp up and the fan down to avoid getting cold unless I am driving due west with the sun shining directly on me.