AO Silver Member
Join Date: Apr 2002
Re: Do you leave your AC turned on???
On modern cars the A/C is controlled by the engine management. When you push the A/C button or the climate control wants the A/C compressor to engage, this is signalled to the ECU. The ECU then compensates by richening the mixture, or increasing the idle (depending on the situation) before it sends a signal to the A/C compressor relay. Also, if the throttle angle exceeds a set limit or is floored fast the ECU will cut out the A/C compressor. My old 155 16V had this feature, so does my 156 Selespeed.
Alfas also have variable displacement A/C compressors which ensures there's not much power drain at lower temperatures. Which means it hardly saps any power during the winter but still helps demist the windows.
So basically, I leave the climate control in charge of the A/C....