Dclark, The compressor will cycle #1 Because of the freon being low. #2. The low pressure switch may be bad. #3. And most common. Because of the small passenger compartment, the air gets cold fast and there isn't enough heated air to pass over the evaporator core in the car so the LP switch is cutting on and off to keep the system from freezing up. Turn the fan on 3 and it will normally slow down or put the mode switch to normal and add a little heat and again it will slow the cycling. Either way you will be cool and comfortable inside. John Hervey www.specialTauto.com << I will check for the heat exchange. My concern was that the compressor will not stay engaged but once it gets to the point that the fans will stay on it seems to stay engaged. I do not know if it makes a difference but there is an audible clicking from the relay compartment every time the ac turns on or off. >>