Expansion Valve: Service and Repair

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. 64 50 ... Instructions For Handling Refrigerant R 134a







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 64 53 515 Replacing Desiccant Insert For Air Conditioning System







Necessary preliminary tasks:
- Drawing off, evacuating and filling the A/C system 64 50 009 Drawing Off, Evacuating and Filling A/C System (R 134a) are not included in the time value given for this work operation
- Remove lower section of microfilter housing 64 31 081 Removing and Installing/Replacing 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 64 50 009 Drawing Off, Evacuating and Filling A/C System (R 134a)

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