64 52 523 Removing and Installing/Replacing A/C System Compressor

64 52 523 Replacing Heating And Air Conditioning Compressor (N52T, N53)

Special tools required:







WARNING:
Danger of injury.
Refrigerant circuit is under high pressure.
Follow safety information for handling R 134a tetrafluorethane refrigerant.
Avoid contact with refrigerant and refrigerant fluid.
Follow safety information for handling refrigerant fluid.







IMPORTANT:
Aluminium-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminium screws/bolts exclusively.
Aluminium screws/bolts must be replaced each time they are released.
The end faces of aluminium 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).
Risk of damage.
Restart engine only when heating and air conditioning system has been correctly filled.
Read and comply with notes on replacing compressor.
Follow notes for opening and replacing parts in refrigerant circuit.
If Air conditioning system is opened for more than 24 hours:
Replace desiccant insert for heating and air conditioning system







Necessary preliminary work:
- Drawing off, evacuating and filling the heating and air conditioning system are not included in the time value given for this job item
- Remove alternator drive belt
- Remove coolant thermostat







Disconnect connector connection (1) on heating and air conditioning compressor.
Release screws (2, 3).
Tightening torque 64 52 1AZ.
Disconnect pressure and intake pipes.

Installation note:
Replace sealing rings.
Use special tool 00 9 030 to install sealing rings without damaging them.







Release screw (1).
Tightening torque 64 53 7AZ.
Remove intake pipe (2) from intake pipe (3).







IMPORTANT: Seal openings or lines on compressor with special tool 32 1 270 to prevent escape of media and dirt contamination.







NOTE:
Secure compressor (3) against falling out.
Release bolt (2) and if necessary remove with bush behind.
Release screw (1).
Tightening torque 64 52 3AZ.
Remove compressor (3) towards front.

Installation note:
Make sure bushes are installed correctly.
If necessary, replace faulty bushes.







After installation:
- Evacuate and fill heating and air conditioning system