Alan

There is confusion here. Once the AC is selected & running the clutch is not supposed to cycle to control temperature - the only thing that controls temperature in any mode is the heater flap modulation. When active the compressor will only cycle off if the evaporator freezes up - this should be rare unless external temps are low and its humid.

The modes: DEF, Recirculate (if equipped) and AC button on - all activate the compressor.

Alan

928porschemangreg

I was correcting another post that assumed the compressor had a problem being a seized clutch. What I meant to say was I can engage the AC, and I can turn it off, but only at the full Off position. I think it is a slider selector, relay or AC switch issue. I will test the AC switch first. Thanks for the input Alan.

Randy V

Not sure if same on your car, but on mine tthe AC is engaged when the slider is placed in the 'recirculation' mode.