64 52 521 Replacing A/C system compressor (N52)
Follow safety instructions for handling R134a refrigerant
Follow safety instructions for handling refrigerant oil
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 ).
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 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 .
Release screw (1).
Unfasten screws (2).
For tightening torque refer to 64 52 3AZ in 64 52 A/C COMPRESSOR .
Remove compressor towards front.
After installation:
- Evacuate and fill A/C system
- Fill and vent cooling system and check for leaks