Expansion Valve: Service and Repair

64 51 520 Removing and installing/replacing expansion valve (N55, N47)

Special tools required:







WARNING:
Danger of injury.
Refrigerant circuit is under high pressure.
Avoid contact with refrigerant and refrigerant fluid.
Read and comply with safety instructions:
- Handling R 134a tetrafluorethane refrigerant
- Handling refrigerant fluid







IMPORTANT:
Risk of damage.
Restart engine only when A/C system has been correctly filled.
Follow notes for opening and replacing parts in refrigerant circuit.

NOTE:
If air conditioning system is opened for more than 24 hours:
- Replace desiccant insert for air conditioning.







Necessary preliminary tasks:
- Drain off air conditioning system
- Remove intake silencer housing







Release screws (1).
Tightening torque 64 53 11AZ.
Detach refrigerant lines (2) from expansion valve (3).

Installation note:
Replace sealing rings.
Use special tool 00 9 030 to install sealing rings without damaging them.







Release screws (1).
Tightening torque 64 53 10AZ.
Remove expansion valve (2) from retaining clip.







Installation note:
Place expansion valve (1) exactly on refrigerant lines (2) and (3).
Fit screws of expansion valve (1) and make sure retaining clip (4) is correctly positioned.







After installation:
- Evacuate and fill air conditioning system