64 52 521 Replacing air conditioning compressor (S55)
Special tools required:
- 00 9 030
- 32 1 270
- Refrigerant circuit is under high pressure!
- Avoid contact with refrigerant and refrigerant oil
- Refer to applicable instructions and safety information for handling refrigerant:
- 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. Refer to 64 52... NOTES ON CHANGING THE AIR-CONDITIONING COMPRESSOR, DETERMINATION OF THE COOLANT OIL LEVEL (COOLANT OIL LEVEL OF NEW AIR-CONDITIONING COMPRESSOR NOT KNOWN) or 64 52... NOTES ON REPLACING AIR CONDITIONING COMPRESSOR, DETERMINING THE AMOUNT OF REFRIGERANT OIL (AMOUNT OF REFRIGERANT OIL FOR NEW AIR CONDITIONING COMPRESSOR NOT KNOWN) .
Follow INSTRUCTIONS FOR OPENING AND REPLACING PARTS IN REFRIGERANT CIRCUIT .
If Air conditioning is opened for more than 24 h:
REPLACE CONDENSER FOR AIR CONDITIONING .
Necessary preliminary work:
- Refer to DRAWING OFF, EVACUATING AND FILLING THE AIR CONDITIONING
- Remove DRIVE BELT FOR ALTERNATOR
- Remove LEFT INTAKE SILENCER HOUSING
- Partially remove EXPANSION TANK FOR COOLANT
Removal:
Release screw (1) from below.
Release screws (4) and remove refrigerant lines (3).
Unfasten plug connection (2) and disconnect.
Release screws (5).
Feed out compressor (1) in upward direction.
Installation:
Replacement:
- Adjust the amount of refrigerant oil in the new compressor
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! Refer to 64 52... NOTES ON CHANGING THE AIR-CONDITIONING COMPRESSOR, DETERMINATION OF THE COOLANT OIL LEVEL (COOLANT OIL LEVEL OF NEW AIR-CONDITIONING COMPRESSOR NOT KNOWN) or 64 52... NOTES ON REPLACING AIR CONDITIONING COMPRESSOR, DETERMINING THE AMOUNT OF REFRIGERANT OIL (AMOUNT OF REFRIGERANT OIL FOR NEW AIR CONDITIONING COMPRESSOR NOT KNOWN)
Compliance with safety information is mandatory! Refer to 64 52... NOTES ON CHANGING THE AIR-CONDITIONING COMPRESSOR, DETERMINATION OF THE COOLANT OIL LEVEL (COOLANT OIL LEVEL OF NEW AIR-CONDITIONING COMPRESSOR NOT KNOWN) or 64 52... NOTES ON REPLACING AIR CONDITIONING COMPRESSOR, DETERMINING THE AMOUNT OF REFRIGERANT OIL (AMOUNT OF REFRIGERANT OIL FOR NEW AIR CONDITIONING COMPRESSOR NOT KNOWN)
Insert the compressor (1) and position it correctly.
Tighten down screws (5).
Tightening torque: 64 52 3AZ .
Position refrigerant lines (3) correctly.
Tighten down screws (4).
Tightening torque: 64 52 1AZ .
Connect plug connection (2).
Use special tool 00 9 030 to mount sealing rings without damaging them.
Tighten the screw (1) from the bottom.
Tightening torque: 64 52 3AZ .
After installation: