Expansion Valve: Service and Repair

Expansion Valve

Special tools, testers and auxiliary items required

• A/C Service Station (ROB 134APF)

• Rinsing Device For Refrigerant Circuits (VAS6337/1)

Functions

• 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.

• Refrigerant must be extracted before hand using (ROB 134APF).

• The previously used A/C Service Station can still be used. Refer to V.A.G workshop equipment catalog.

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






1 Screws

• 10 ± 1 Nm

• Quantity 2

2 Refrigerant Lines On Expansion Valve

3 O-ring

• 13.7 mm; 2.5 mm

4 Expansion Valve

• Removing

- Extract refrigerant using (ROB 134APF).

• Remove the heat shield (vehicle-specific), if necessary.


There is a danger of ice-up.

Refrigerant leaks out if refrigerant circuit is not discharged.

Refrigerant must be extracted before opening the refrigerant circuit. If refrigerant circuit is not opened within 10 minutes after extracting, pressure may build up in refrigerant circuit by renewed evaporation. Extract refrigerant once more.

- Remove the bolts - 1 - and the refrigerant pipes - 2 - from the expansion valve.

- Remove the bolts - 8 - and the expansion valve.

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