64 51 525 Removing and installing or replacing expansion valve
Special tools required:
Refrigerant circuit is under high pressure!
Avoid contact with refrigerant and refrigerant oil.
Read and comply with safety instructions:
- Handling R 134a tetrafluorethane refrigerant. See NOTE FOR HANDLING R134A REFRIGERANT or SAFETY INFORMATIONS FOR HANDLING TETRAFLUORETHANE REFRIGERANT R134A .
- Handling REFRIGERANT FLUID
Restart engine only when A/C system has been correctly filled.
Follow NOTES for opening and replacing parts in refrigerant circuit.
If air conditioning system is opened for more than 24 hours: Replacing DESICCANT INSERT for air conditioning system
Necessary preliminary tasks:
- Draw off the HEATING AND AIR CONDITIONING SYSTEM
- Remove SOUND INSULATION FROM BULKHEAD UPPER SECTION
Feed out line feed-through (1) towards top.
Release screws (1) and remove refrigerant lines (2) with associated gasket.
Tightening torque 64 53 1AZ .
Installation note:
Replace sealing rings.
Use special tool 00 9 030 to install sealing rings without damaging them.
F02/F03 Automatic rear air-conditioning system only:
Release screw (1).
Tightening torque 64 53 7AZ .
Remove refrigerant line (2) with associated gasket.
Installation note:
Replace sealing rings.
Use special tool 00 9 030 to install sealing rings without damaging them.
Unscrew nuts (1).
Tightening torque 64 53 9AZ .
Remove sealing plate (2) by maneuvering upwards.
Feed out foam material (1).
Unfasten screws (2).
Tightening torque 64 53 2AZ .
Carefully remove flange (3) with expansion valve behind.
Installation note:
Replace sealing rings.
Use special tool 00 9 030 to mount sealing rings without damaging them.
Flange (3) must be correctly seated on expansion valve.
After installation:
- Evacuate and fill A/C SYSTEM