64 52 521 Replacing A/C Compressor

64 22 521 Removing And Installing/replacing A/C System Compressor (N52K)

Special tools required:







WARNING:
Risk of injury.
Refrigerant circuit is under high pressure.
Follow safety instructions for handling R 134a refrigerant.
Avoid contact with refrigerant and refrigerant oil.
Follow safety instructions for handling refrigerant oil.







IMPORTANT:
Aluminium magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminium screws/bolts exclusively.
Aluminium screws/bolts must be replaced each time they are released.
The end faces of aluminium screws/bolts are painted blue for the purposes of reliable identification.
Jointing torque and angle of rotation must be observed without fail (risk of damage).







IMPORTANT:
Risk of damage.
Restart engine only when air conditioning system has been correctly filled.
Read and comply with notes on replacing compressor.
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 tasks:
- Drawing off, evacuating and filling the A/C system are not included in the time value given for this work operation
- Remove A/C compressor drive belt
- Remove coolant thermostat
- Remove assembly underside protection at side top







Release screw (1).
Tightening torque 64 53 1AZ.
Release screw (2) and remove refrigerant line (3).
Tightening torque 64 53 4AZ.

Installation:
Replace sealing rings.
Use special tool 00 9 030 to mount sealing rings without damaging them.







Release screw (1) and remove refrigerant line.
Tightening torque 64 53 4AZ.
Disconnect plug connection (2).
Release screws (3) and remove compressor () by pulling upwards.

Installation:
- Replace screws (3)
- Tightening torque 64 52 3AZ.
- Make sure line (4) is correctly routed
- Check adapter sleeves for damage, replace if necessary







After installation:
- Fill cooling system, vent and check for leaks.
- Evacuate and fill A/C system

'uuA: