64 52 521 Replacing A/C Compressor

64 52 521 Replacing A/C System Compressor (N52, AWD)

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
- Release expansion tank and place to one side
- Remove fan cowl
- Remove A/C compressor drive belt
- Remove front underbody protection
- Remove lower radiator cover
- Remove coolant thermostat







Release screws (1) and remove refrigerant lines.

Tightening torque 64 52 1AZ.

Disconnect plug connection (2).

Installation:
Replace sealing rings.

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







Release retaining clip (1) and feed out refrigerant line (2).







Release screw (1).

Tightening torque 64 52 3AZ.







IMPORTANT: Close openings or line to compressor with special tool 32 1 270, to avoid media leak and dirt contamination.







Secure compressor (2) against falling out.

Release bolts (1) and feed out compressor (2) towards bottom.

Tightening torque 64 52 3AZ.







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

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