Refrigerant Pressure Sensor / Switch: Service and Repair

64 53 521 Replacing Safety Pressure Switch (N74)







WARNING:
Risk of injury.
Refrigerant circuit is under high pressure.
Avoid contact with refrigerant and refrigerant oil.
Read and comply with safety regulations:
- Handling R 134a refrigerant
- Handling refrigerant oil







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 opened for more than 24 hours:Replacing drier insert for A/C system







Necessary preliminary tasks:
- Drain off air conditioning system
- Remove right intake filter housing







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