64 52 523 Removing and Installing/Replacing A/C System Compressor

64 52 523 Replacing A/C System Compressor (N52)

Special tools required:







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







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 compressor replacement.

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 heating and air conditioning system







Necessary preliminary work:
- Drain off air conditioning system
Remove alternator drive belt
- Remove coolant thermostat







Release and disconnect plug connection (1) at A/C compressor.
Release screws (4).
Tightening torque 64 52 1AZ.
Remove suction line (2) and pressure line (3).

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







IMPORTANT: Seal openings or lines on compressor with special tool 32 1 270 to prevent escape of media and dirt contamination.







NOTE:
Secure compressor (3) against falling out.
Release bolt (2) and if necessary remove with bush behind.
Release screw (1).
Tightening torque 64 52 3AZ.
Remove compressor (3) towards front.

Installation note:
Make sure bushes are installed correctly.
If necessary, replace faulty bushes.







After installation:
- Evacuate and fill heating and air conditioning system