A8 Quattro Sedan V8-4.2L (AKB) (2002)
Low Pressure Sensor / Switch: Description and Operation
A/C Refrigerant Low Pressure Switch -F73-
Function
Switches A/C clutch -N25- OFF if system suction pressure is too low (low refrigerant charge). This switch protects the compressor if the refrigerant
system is empty.