Refrigerant Pressure Sensor / Switch: Service and Repair

64 53 520 Replacing Safety Pressure Switch







WARNING:
Danger of injury.
Refrigerant circuit is under high pressure.
Follow safety instructions for handling R 134a (tetrafluorethane) refrigerant.
Avoid contact with refrigerant and refrigerant fluid.
Follow safety instructions for handling refrigerant fluid.







IMPORTANT:
Risk of damage.
Restart engine only when air conditioning system has been correctly filled.
Follow instructions for opening and replacing parts in refrigerant circuit.
If air conditioning system is open for longer than 24 hours: replace desiccant insert for air conditioning







Necessary preliminary work:
- Drain off air conditioning system







Unclip wiring loom (1).
Pull expansion tank (2) upward out of retaining bracket.







Unfasten plug connection (1) and disconnect.

Installation note:
Guide pin (2) must be fit correctly in rubber guide (3).







Unfasten plug connection (1) and disconnect.
Release safety pressure switch (2) and remove.
Tightening torque 64 53 8AZ.







After installation:
- Evacuate and fill A/C system