64 52 521 Replacing A/C system compressor (N52k)

WARNING: This page is about a different car, the 2013 BMW Z4, 2012 BMW Z4, 2011 BMW Z4, 2010 BMW Z4, and 2009 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

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
Release expansion tank and place to one side
Remove alternator DRIVE BELT
Remove COOLANT THERMOSTAT

Release screws (1).

Tightening torque 64 52 1AZ .

Remove suction line (2) and pressure line (3).

Installation:

Replace sealing rings.

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

Disconnect associated plug connection on compressor

Fig 1: Identifying Suction Line, Pressure Line With Mounting Screws

Courtesy of BMW OF NORTH AMERICA, INC.

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

NOTE: Secure compressor (3) against falling out.

Release screw (1).

Unfasten screws (2).

Tightening torque 64 52 2AZ .

Remove compressor towards front.

Fig 2: Identifying Compressor With Mounting Screws

Courtesy of BMW OF NORTH AMERICA, INC.

After installation

EVACUATE AND FILL A/C SYSTEM
Fill cooling system . See 1700039 VENTING AND FILLING COOLING SYSTEM WITH VACUUM FILLING UNIT or 1700009 CHECKING COOLING SYSTEM FOR LEAKS (N54, N52K) , vent and check for leaks.