64 52 523 Replacing A/C system compressor (N52)
Special tools required:
Refrigerant circuit is under high pressure!
Observe the safety information for handling the R 134a refrigerant . See 64 50... NOTE FOR HANDLING R134A REFRIGERANT or 64 50... SAFETY INFORMATIONS FOR HANDLING TETRAFLUORETHANE REFRIGERANT R134A !
Avoid contact with refrigerant and refrigerant oil.
FOLLOW SAFETY INSTRUCTIONS FOR HANDLING REFRIGERANT OIL !
Restart engine only when A/C system has been correctly filled.
Read and comply with notes on compressor replacement . See 64 52... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR NOT KNOWN) or 64 52... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR KNOWN) .
FOLLOW NOTES FOR OPENING AND REPLACING PARTS IN REFRIGERANT CIRCUIT .
If Air conditioning is opened for more than 24 h:
Replace desiccant insert for heating and air conditioning system
No steel screws/bolts may be used due to the threat of electrochemical corrosion!
A magnesium crankcase requires aluminum screws/bolts exclusively!
Aluminium 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 work:
- DRAIN OFF AIR CONDITIONING SYSTEM Remove alternator DRIVE BELT
- Remove coolant thermostat
Release and disconnect plug connection (1) at A/C compressor.
Release screws (4).
Tightening torque 64 52 1AZ .
Remove intake pipe (2) and pressure line (3).
Installation note:
Replace sealing rings.
Use special tool 00 9 030 to mount sealing rings without damaging them.
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.
Replacement:
- Adjust the amount of refrigerant oil in the new compressor. See 64 52... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR KNOWN) or 64 52... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR NOT KNOWN) .
Danger of customer complaints due to reduced cooling power of the Air conditioning!
Before the installation of the new compressor, it is absolutely necessary to adjust the amount of refrigerant oil in the new compressor!
The safety information must be observed . See 64 52... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR NOT KNOWN) or 64 52... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR KNOWN) !
After installation: