Refrigerant Pressure Sensor / Switch: Service and Repair

64 53 520 Replacing Safety Pressure Switch

Special tools required:







WARNING:
Danger of injury.
Refrigerant circuit is under high pressure.
Follow safety instructions for handling R 134a (tetrafluorethane) refrigerant.
Follow safety instructions for handling refrigerant fluid.
Avoid contact with refrigerant and 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 opened for more than 24 hours: Replacing desiccant insert for air conditioning system







Necessary preliminary work:
- Drain off air conditioning system







Disconnect plug connection (1) and release safety pressure switch (2).

Installation note:
Replace sealing rings.
Use special tool 00 9 030 to mount sealing rings without damaging them.
Tightening torque 64 53 6AZ.







After installation:
- Evacuate and fill heating and air conditioning system
- Check leak-tightness of valve insert with soap solution
In event of leakage:
- In event of leakage:
- Check sealing surfaces on line and valve insert for damage, replace line or valve insert if necessary
- If necessary, carry out leak detection