64 52 521 Replacing air conditioning system compressor (N55)
Special tools required :
WARNING:
Danger of injury!
Refrigerant circuit is under high pressure!
Avoid contact with refrigerant and refrigerant oil.
Read and comply with safety instructions:
Refrigerant circuit is under high pressure!
Avoid contact with refrigerant and refrigerant oil.
Read and comply with safety instructions:
- Handling R 134a refrigerant . See 6450... NOTE FOR HANDLING R134A REFRIGERANT and 6450... SAFETY INFORMATIONS FOR HANDLING TETRAFLUORETHANE REFRIGERANT R134A
- HANDLING REFRIGERANT FLUID
IMPORTANT:
Risk of damage!
Restart engine only when A/C system has been correctly filled.
Read and comply with notes on compressor replacement . See 6452... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR NOT KNOWN) or 6452... 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 condenser for air conditioning . See 64 53 551 REMOVING AND INSTALLING/REPLACING CAPACITOR (WITH DESICCANT INSERT) FOR HEATING AND AIR CONDITIONING SYSTEM or 64 53 551 REMOVING AND INSTALLING/REPLACING CAPACITOR (WITH DESICCANT INSERT) FOR HEATING AND AIR CONDITIONING SYSTEM .
Restart engine only when A/C system has been correctly filled.
Read and comply with notes on compressor replacement . See 6452... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR NOT KNOWN) or 6452... 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 condenser for air conditioning . See 64 53 551 REMOVING AND INSTALLING/REPLACING CAPACITOR (WITH DESICCANT INSERT) FOR HEATING AND AIR CONDITIONING SYSTEM or 64 53 551 REMOVING AND INSTALLING/REPLACING CAPACITOR (WITH DESICCANT INSERT) FOR HEATING AND AIR CONDITIONING SYSTEM .
Necessary preliminary work :
- DRAWING OFF, EVACUATING AND FILLING THE A/C SYSTEM are not included in the time value given for this work operation
- Remove drive belt for alternator . See 11 28 010 REPLACING DRIVE BELT FOR ALTERNATOR (N55)
- Remove left charge air duct See 11 61 365 REMOVING AND INSTALLING/REPLACING LEFT-HAND CHARGE AIR DUCT (N55) .
IMPORTANT:
Seal openings or lines on compressor with special tool 32 1 270
to prevent escape of media and dirt contamination.
Release screw (1) from below.
Tightening torque: 64 52 3AZ .
Release screws (4) and remove refrigerant lines (3).
Tightening torque: 64 52 1AZ .
Unfasten plug connection (2) and disconnect.
NOTE:
Secure compressor (1) against falling out.
Release screws (5).
Tightening torque: 64 52 3AZ .
Feed out compressor (1) in upward direction.
Installation note :
Replace sealing rings.
Use special tool 00 9 030 to mount sealing rings without damaging them.
Replacement :
- Adjust the amount of refrigerant oil in the new compressor . See 6452... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR NOT KNOWN) or 6452... 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 6452... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR NOT KNOWN) or 6452... 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 6452... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR NOT KNOWN) or 6452... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR KNOWN) .
After installation :