The A/C causes the engine to idle at 750 rpm, not 500 as usual and yes, the A/C fan does bring the temperature down.

I'm beginning to think that the radiator fan is controlled by a combination of data, from engine and external temperature and status of the A/C. All this stuff is BMW, after all.

Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...