64 52 524 Removing And Installing/Replacing Heating And Air Conditioning System Compressor

64 52 524 Removing And Installing/Replacing A/C System Compressor (N74)

Special tools required:







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







IMPORTANT:
Risk of damage.
Restart engine only when air conditioning system has been correctly filled.
Read and comply with notes on compressor replacement.
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 air conditioning system.







Necessary preliminary work:
- Drain off air conditioning system
- Remove hydraulic steering gear
- Remove drive belt for alternator
- Remove air conditioning compressor drive belt







Unfasten plug connection (1) and disconnect.

NOTE: Screws of varying lengths are installed.

Slacken screw (2).
(Observe instructions for releasing the screw (2) in the work step below.)
Release screws (3) and (5).
Tightening torque 64 52 3AZ.
Remove air conditioning compressor (6) holder (4).
Lower the compressor (6).

Installation note:
Place holder (4) on compressor and secure with screw (2).
Tighten screws (5) and (6).







Place tool (1) with extension and joint in the front bumper area as illustrated.
Release screw.







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







IMPORTANT: Secure compressor against falling.

Release screw (1).
Tightening torque 64 52 1AZ.
Remove low pressure line connection (2).

Installation note:
Replace sealing rings.
Use special tool 00 9 030 to mount sealing rings without damaging them.
Feed out compressor (3) along with high pressure line.







Replacement:
Release screw (1).
Remove low pressure line (2).
Tightening torque 64 52 1AZ.

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







After installation:
- Evacuate and fill A/C system