64 52 521 Replacing air conditioning compressor (N54)

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WARNING: Risk of injury!
Refrigerant circuit is under high pressure!
Work on the cooling system may only be carried out when it has cooled down.

Follow safety instructions for handling refrigerant See 6450... INSTRUCTIONS FOR HANDLING REFRIGERANT R 134A or 6450... SAFETY INSTRUCTIONS FOR HANDLING REFRIGERANT R134A .

Follow safety instructions for handling REFRIGERANT OIL .

Avoid contact with refrigerant and refrigerant oil.

IMPORTANT: Aluminum magnesium materials.

No steel screws/bolts may be used due to the threat of electrochemical corrosion.

A magnesium crankcase requires aluminum screws/bolts exclusively.

Aluminum screws/bolts must be replaced each time they are released.

The end faces of aluminum 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 A/C system has been correctly filled.
READ AND COMPLY WITH NOTES ON REPLACING COMPRESSOR.
Follow INSTRUCTIONS for opening and replacing parts in refrigerant circuit.
If A/C 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 air conditioning compressor drive belt. See 11 28 010 REPLACING DRIVE BELT FOR ALTERNATOR (N54, N54T) .
Remove suction filter housing. See 13 71 000 REMOVING AND INSTALLING/REPLACING INTAKE FILTER HOUSING (N54) .
Remove left charge-air duct. See 11 61 365 REMOVING AND INSTALLING/REPLACING LEFT CHARGE AIR DUCT (N54, N54T) .

Release screws (1) and remove refrigerant lines. Tightening torque, see 64 52 1AZ in 64 52 A/C COMPRESSOR . Installation: Replace sealing rings. Use special tool 00 9 030 to mount sealing rings without damaging them. Unfasten plug connection (2) and disconnect.

Fig 1: Release Screws (1) And Remove Refrigerant Lines