64 52 523 Replacing A/C compressor (N52T, N53)
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Special tools required:
WARNING:
Danger of injury!
Refrigerant circuit is under high pressure!
Observe SAFETY INFORMATION for handling refrigerant and refrigerant oil.
Refrigerant circuit is under high pressure!
Observe SAFETY INFORMATION for handling refrigerant and 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 NOTES (AMOUNT OF REFRIGERANT OIL OF NEW COMPRESSOR NOT KNOWN) -or- NOTES (AMOUNT OF REFRIGERANT OIL OF NEW 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. See REPLACING DESICCANT INSERT or REPLACING DESICCANT INSERT (CAPACITOR REMOVED) .
Restart engine only when A/C system has been correctly filled.
Read and comply with notes on compressor replacement. See NOTES (AMOUNT OF REFRIGERANT OIL OF NEW COMPRESSOR NOT KNOWN) -or- NOTES (AMOUNT OF REFRIGERANT OIL OF NEW 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. See REPLACING DESICCANT INSERT or REPLACING DESICCANT INSERT (CAPACITOR REMOVED) .
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.
Aluminum 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.
Aluminum 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:
- DRAWING OFF, EVACUATING AND FILLING THE A/C SYSTEM are not included in the time value given for this work operation
- Remove alternator DRIVE BELT
- Remove COOLANT THERMOSTAT
Disconnect plug 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 mount 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.
Replacement:
- Adjust the amount of refrigerant oil in the new compressor. See NOTES (AMOUNT OF REFRIGERANT OIL OF NEW COMPRESSOR NOT KNOWN) -or- NOTES (AMOUNT OF REFRIGERANT OIL OF NEW 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 notes on refrigerant oil must be observed! See NOTES (AMOUNT OF REFRIGERANT OIL OF NEW COMPRESSOR NOT KNOWN) -or- NOTES (AMOUNT OF REFRIGERANT OIL OF NEW 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 notes on refrigerant oil must be observed! See NOTES (AMOUNT OF REFRIGERANT OIL OF NEW COMPRESSOR NOT KNOWN) -or- NOTES (AMOUNT OF REFRIGERANT OIL OF NEW COMPRESSOR KNOWN) .
After installation: