64 51 520 Removing and Installing/Replacing Expansion Valve

64 51 520 Removing And Installing Or Replacing Expansion Valve

Special tools required:







WARNING:
Risk of injury.
Refrigerant circuit is under high pressure.
Follow safety instructions for handling R 134a refrigerant.
Avoid contact with refrigerant and refrigerant oil.
Follow safety instructions for handling refrigerant oil.







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

NOTE: If A/C system is opened for more than 24 hours: Replace desiccant insert for A/C system







Necessary preliminary tasks:
- Drawing off, evacuating and filling the A/C system are not included in the time value given for this work operation
- Remove lower section of microfilter housing







Release screws (1, 2), disconnect refrigerant lines and lay to one side.
Tightening torque 64 53 2AZ.

Installation:
Replace sealing rings.

Use special tool 00 9 030 to mount sealing rings without damaging them.







Release screws (1) and remove expansion valve (2).
Tightening torque 64 53 13AZ.







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







After installation:
- Evacuate and fill A/C system

`Q4: