600SEL (140.057) V12-6.0L (120.980) (1993)
Refrigerant Pressure Sensor / Switch: Service and Repair
Air conditioner
Empty (recycling).
Plug (B12)
Disconnect from refrigerant pressure transmitter (B12), by pressing the retaining spring (arrow).
Refrigerant pressure transmitter (B12)
Unscrew.
Connection in receiver dehydrator
Seal off (parts set 140 830 01 27).
Install
In reverse sequence. Lubricate O-ring with compressor oil (refer to note) and tighten the refrigerant pressure transmitter (B12) to 10 ± 4 Nm.
Air conditioner
Evacuate, refill, check function and check for leaks; run engine at idle speed only in the first 4 minutes.
Function test
Perform by disconnecting plug at coolant temperature sensor B10/8 and setting 310 Ohm (stage I) or 250 Ohm (stage II) with an ohm decade;
switch on ignition and set control unit (KLA) to "Auto". Auxiliary fans rotate clockwise.
NOTE: After completing the work:
Erase fault memory in the control unit.
Auxiliary Fan Switching Points