Expansion Valve: Service and Repair

Expansion Valve

Special tools, testers and auxiliary items required

• Torque wrench (V.A.G 1331/) (5 to 50 Nm)

• A/C service station (VAS 6007A) or succeeding model.

• Refrigerant must be extracted before hand using e.g. A/C service station (VAS 6007A).

• The previously used service stations can still be used => catalog V.A.G tools.

• To prevent the ingress of dampness all components of the refrigerant circuit which have been opened must be sealed with suitable plugs.

• On some vehicles, connecting pipe from charge air cooler should be removed

Function

• The expansion valve atomizes the streaming refrigerant and controls the flow quantity so that the vapor is gaseous only at the evaporator outlet, depending on the heat transmission.

Only for vehicles with shielding plate in front of expansion valve

• Clamping washers are installed on right hand drive vehicles instead of a clamp and nut.

- Remove the nut - 1 - (6 ± 0.9 Nm).





- Loosen clips - 2 - and remove shielding plate - 3 -.

All vehicles





1 Screws

• 10 ± 1 Nm

• Qty. 2

2 Refrigerant lines on expansion valve

3 O-ring

• 13.7 mm; 2.5 mm

4 Expansion Valve

• Removing:

- Extract refrigerant e.g. using A/C service station (VAS 6007A).

CAUTION!
There is a danger of ice-up.

Refrigerant leaks out if refrigerant circuit is not discharged.

Refrigerant must be extracted before opening refrigerant circuit. If refrigerant circuit is not opened within 10 minutes of extraction, pressure may form in refrigerant circuit due to evaporation. Extract refrigerant once more.

- Remove screws - 1 - and disconnect refrigerant lines - 2 - from expansion valve.

- Remove screws - 8 - and remove expansion valve - 4 -.

5 O-ring

• 14 mm; 1.82 mm

• Coat with refrigerant oil when installing

6 O-ring

• 10.8 mm; 1.82 mm

• Coat with refrigerant oil when installing

7 O-ring

• 9.5 mm; 2.5 mm

8 Cylindrical combination bolt

• 5 Nm