64 52 521 Replacing A/C Compressor

64 52 521 Replacing A/C system compressor (N51)

Special tools required:







WARNING:
Risk of injury.
Refrigerant circuit is under high pressure.

Follow safety instructions for handling R 134a refrigerant.
Follow safety instructions for handling refrigerant oil. 64 50 ... Instructions For Handling Refrigerant R 134a
Avoid contact with refrigerant and 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. 64 52 ... Instructions For 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 A/C system. 64 53 515 Replacing Desiccant Insert For Air Conditioning System







Necessary preliminary tasks:
- Drawing off, evacuating and filling the A/C system 64 50 009 Drawing Off, Evacuating and Filling A/C System (R 134a) are not included in the time value given for this work operation
- Release expansion tank and place to one side
- Remove fan cowl Service and Repair
- Remove air conditioning compressor drive belt Service and Repair
- Remove coolant thermostat Service and Repair







Release screws (1, 2) and remove refrigerant lines.
Tightening torque 64 52 1AZ.

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

Disconnect plug connection (3).







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

NOTE: Secure compressor (3) against falling out.







Release screw (1).
Unfasten screws (2).
Tightening torque 64 52 3AZ.
Remove compressor towards front.







After installation:
- Evacuate and fill A/C system 64 50 009 Drawing Off, Evacuating and Filling A/C System (R 134a)
- Fill and vent cooling system 17 00 039 Venting Cooling System and Checking For Water Leaks and check for leaks

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