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

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WARNING:

Risk of injury!

Refrigerant circuit is under high pressure!

Follow safety instructions for Handling Refrigerant R 134A .

Follow safety instructions for Handling Refrigerant Oil .

Avoid contact with refrigerant and refrigerant oil.

IMPORTANT:

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 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. See 17 11 035 REMOVING AND INSTALLING/REPLACING FAN COWL WITH ELECTRIC FAN (N52/N52K/N53) .
Remove air conditioning compressor drive belt. See 11 28 010 REPLACING ALTERNATOR DRIVE BELT (N51) .
Remove coolant thermostat. See 11 53 000 REMOVING AND INSTALLING/REPLACING COOLANT THERMOSTAT (N51) .

Release screws (1, 2) 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. Disconnect plug connection (3).

Fig 1: Removing And Installing Refrigerant Lines

Courtesy of BMW OF NORTH AMERICA, INC.

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, see 64 52 3AZ in 64 52 A/C COMPRESSOR . Remove compressor towards front.

Fig 2: Removing Compressor

Courtesy of BMW OF NORTH AMERICA, INC.

After installation: Evacuate and fill A/C system . Fill and vent cooling system and check for leaks. See 17 00 039 VENTING COOLING SYSTEM AND CHECKING FOR WATER LEAKS (N52/N52K/N51/N53) .