John,
Years ago I remember a Lincoln Continental that did exactly that. As I
recall, it had a switch that reacted to engine vacuum. It would cutout the
compressor and drop the AC fan to low when the throttle was opened. I have
been meaning to investigate it further but never got a Round-Tuit.
Ken Lewis
http://neksiwel.20m.com/
Vanagon mods, tech info and O2 sensor help