Expansion Valve: Service and Repair

64 51 525 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 R134a refrigerant. 64 50 ... Instructions For Handling Refrigerant R 134a
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.

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 31 062 Removing and Installing/Replacing Left Lower Microfilter Housing Section
- Remove left suspension cross-brace







NOTE: Work described on the E90 by way of example, deviations in detail are possible in other vehicles.

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







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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