During the early 70's a device called the "Pass Master "
was marketed, it used a vacuum switch to cut out the AC clutch during hard
accelleration. I think automakers adopted this logic, and I believe that's
what's happening in your car. Possibly the switch is malfunctioning, and
shutting off the AC clutch too early. Try gently accellerating, a bit
harder each time, and try to see if clutch kicks out during full power [
good ] or any accellerating [ not so good ]