Gordon,
 The actual evaporator temperature of any automotive A/C system MUST stay
at or above 32 degrees. Below this point, the condensate water will
freeze and block airflow through the evaporator. Most systems have a
sensor which will shut down the compressor if the evaporator temp drops
below 32 degrees Fahrenheit.

R-12 Freon will drop the temperature of the ambient air approx. 20
degrees in a well designed system. With the A/C system set to Max (or
recirculate) the same interior air gets passed through the system again
and again. This is how the temperature in the car will drop from 140
degrees ( here in S. Fla.) of a parked car, to a comfortable 65-75
degrees.

Charlie Kuss
RV-8A fuselage
Boca Raton, Fl.

Do you know of any suplyers that carry kits for auto  AC units ready to
install and which ones are the smallest? The marine industry has many all
in one package units like that,  but they are water cooled.
Bulent

Hi Buly,
 Yes, there are some automotive based A/C retrofit units available. They use the very reliable Sanden (made in Japan) compressors. I don't know weights. The evaporators, condensors and aluminium tubing is very light. I would guess (and I stress guess) that the compressors weigh about 7 - 10 pounds. An adapter bracket will add 2 more pounds. The rubber hoses will add approx. 2-3 pounds.
 I would suggest getting the A/C components from a Honda Civic out of the junk yard. The compressor and clutch on these are very small. GM also uses a VR-5 compressor on a lot of their FWD models which is small. (This is the same compressor used on your Cadillac) It is also cheaper to replace than the Honda unit. Contact me off list and I can help you design a system.
 I happen to have a perfectly good A/C condenser cooling fan off of a Jap sub compact car. It is light and I think it has your name on it. Come get it and it's yours!
Charlie Kuss

 
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