64 52 523 Replacing air conditioning compressor (N20)
Special tools required:
WARNING:
Danger of injury!
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 fluid.
FOLLOW SAFETY INSTRUCTIONS FOR HANDLING REFRIGERANT OIL !
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 fluid.
FOLLOW SAFETY INSTRUCTIONS FOR HANDLING REFRIGERANT OIL !
IMPORTANT:
Risk of damage!
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) .
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
IMPORTANT:
Aluminium-magnesium materials.
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) !
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 tasks:
- DRAIN OFF AIR CONDITIONING SYSTEM
- Remove alternator DRIVE BELT
- Remove left CHARGE AIR DUCT
Release and disconnect plug connection (2) at A/C compressor.
Release screws (1).
Tightening torque 64 52 1AZ .
Remove refrigerant lines (3).
Installation note:
Replace sealing rings.
Use special tool 00 9 030 to mount sealing rings without damaging them.
IMPORTANT:
Seal openings or lines on compressor with special tool 32 1 270
to prevent escape of media and dirt contamination.
NOTE:
Secure compressor (2) against falling out.
Release screw (1).
Tightening torque 64 52 3AZ .
Feed out compressor (2) upwards to the front.
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 NOT KNOWN) or 64 52... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR KNOWN)
IMPORTANT:
Danger of compressor damage!
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) !
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: