64 52 521 Replacing air conditioning system compressor (N55)
Special tools required:
Restart engine only when A/C system has been correctly filled.
Read and comply with notes on compressor replacement: see NOTES FOR CHANGING AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL NOT KNOWN) or NOTES FOR CHANGING AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL KNOWN) .
Follow notes 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:
- DRAW OFF air conditioning system
- Remove DRIVE BELT FOR ALTERNATOR
- Remove left CHARGE AIR DUCT
Release screw (1) from below.
Tightening torque 64 52 3AZ .
Release screws (4) and remove refrigerant lines (3).
Tightening torque 64 52 1AZ .
Unfasten plug connection (2) and disconnect.
Release screws (5).
Tightening torque 64 52 3AZ .
Feed out compressor (1) in upward direction.
Installation note:
Replace sealing rings.
Use special tool 00 9 030 to mount sealing rings without damaging them.
Replacement:
- Adjust the amount of refrigerant oil in the new compressor: see NOTES FOR CHANGING AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL NOT KNOWN) or NOTES FOR CHANGING AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL KNOWN) .
Danger of compressor damage.
Possibility of reduced cooling power of the Air conditioning.
Before the installation of the new compressor, it is absolutely necessary to adjust the amount of refrigerant oil in the new compressor. See NOTES FOR CHANGING AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL NOT KNOWN) or NOTES FOR CHANGING AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL KNOWN) .
After installation:
- EVACUATE AND FILL air conditioning system