64 52 521 Replacing A/C System Compressor
Special Tools Required
Risk of injury!
Refrigerant circuit is under high pressure!
Handling R134a refrigerant: see SAFETY INSTRUCTIONS and INSTRUCTIONS FOR HANDLING .
Avoid contact with refrigerant and refrigerant oil.
Handling refrigerant oil: see safety instructions for HANDLING REFRIGERANT OIL (FOR REFRIGERANT R134A) .
Risk of damage!
Restart engine only when A/C system has been correctly filled.
Read and comply with INSTRUCTIONS FOR COMPRESSOR REPLACEMENT .
Follow INSTRUCTIONS FOR OPENING AND REPLACING PARTS IN REFRIGERANT CIRCUIT .
If A/C system is opened for more than 24 hours:
Replace DESICCANT INSERT FOR A/C SYSTEM .
Necessary preliminary tasks:
- Drain off refrigerant from A/C system. See DRAWING OFF, EVACUATING AND FILLING A/C SYSTEM (R134A) .
- Remove A/C compressor drive belt. Refer to REPLACING ALTERNATOR DRIVE BELT (N54)
- Remove suction filter housing. Refer to REMOVING AND INSTALLING/REPLACING REAR LEFT CHARGE-AIR DUCT (N54) .
Disconnect plug connection (1).
Release screws (2) and remove refrigerant line.
Tightening torque: 20 Nm
Installation:
Replace all sealing rings and moisten with refrigerant oil.
Release screws (2) and remove compressor (2) by pulling upwards.
Tightening torque 64 52 3AZ .
Replacement:
Read and comply with INSTRUCTIONS FOR COMPRESSOR REPLACEMENT .
If necessary, release screws (1) and modify holder (2).
After installation:
- Evacuate and fill A/C system. Refer to DRAWING OFF, EVACUATING AND FILLING A/C SYSTEM (R134A) .
- Assemble engine