Refrigerant Pressure Sensor / Switch: Service and Repair

64 53 521 Replacing Safety Pressure Switch (N52T, N55)







WARNING:
Danger of injury.
Refrigerant circuit is under high pressure.
Avoid contact with refrigerant and refrigerant fluid.
Read and comply with safety instructions:
- Handling R134a (tetrafluorethane) refrigerant
- Handling refrigerant fluid







IMPORTANT:
Risk of damage.
Restart engine only when A/C system has been correctly filled.
Follow instructions for opening and replacing parts in refrigerant circuit.
If air conditioning system is opened for more than 24 hours:Replace desiccant insert for A/C system.







Necessary preliminary work:
- Drain off air conditioning system







Release screws (1) and (2).
Remove heat shield (3).







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







After installation:
- Evacuate and fill A/C system