64 52 521 Replacing compressor for air-conditioning system (N52)

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)  .

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 Coolant Thermostat

Release screws (1, 2) and remove refrigerant lines.

Disconnect plug connection (3).

Installation: 

Replace all sealing rings and moisten with refrigerant oil.

For tightening torque refer to 64 52 1AZ in 64 52 A/C COMPRESSOR .

Fig 1: Identifying Plug Connection And Refrigerant Lines

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1).

Unfasten screws (2).

For tightening torque refer to 64 52 3AZ in 64 52 A/C COMPRESSOR .

Remove compressor towards front.

Fig 2: Identifying Compressor And Mounting Screws

Courtesy of BMW OF NORTH AMERICA, INC.

After installation: 

• Evacuate and fill A/C System 
• Fill and vent Cooling System and check for leaks