Koennte moeglich sein mit Volllaststellung, in der offiziellen Beschreibung steht aber nichts davon: A special lock sensor control unit monitors the A/C compressor speed in relationship to engine RPM. In the unlikely event of A/C compressor seizure, the lock sensor system will immediately de-energize the compressor clutch, thus insuring uninterrupted water pump/fan operation.
http://bmwe32.masscom.net/sean750/M70info.pdf
bei spaeteren Modellen ist es so wie z B E38, allerdings nur bei unter 8 kmh:
A compressor cut-off relay is placed between the pressure switch and the lock-sensor control module. When energized by the ECM, the cut-off relay interrupts the compressor request signal from the compressor control relay.
The ECM energizes the cut-off relay during wide open throttle acceleration at low vehicle speeds (less than 5 mph (8 km/h)). The lock-sensor control module monitors the following sensors:
• A/C compressor RPM (speed sensor inside compressor)
• Engine crankshaft RPM (TD signal from DME engine control module)
• Engine coolant temperature
If the compressor and engine crankshaft speeds differ by more than 30%, the lock-sensor control module assumes that the A/C compressor is slowing or seizing, and it interrupts power to the clutch. Power remains interrupted until the ignition switch is cycled. The M70 V-12 lock-sensor control module also monitors engine coolant temperature. If it exceeds 240ºF (117ºC), the lock-sensor control module cycles the A/C compressor on and off (20 seconds on/20 seconds off), to reduce engine load. Above 250ºF (120ºC), the locksensor
control module shuts off the A/C compressor.
http://www.meeknet.co.uk/e31/IHKA.pdf
Und hier noch was
https://www.carmanualsonline.info/im...60_2779-25.png
von hier
https://www.carmanualsonline.info/bm...kshop-manual/3