Expansion Valve: Description and Operation

Expansion Valve

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.

• Extract the refrigerant beforehand using the A/C service station (VAS 6007A) (ROB 134APF).

• The previously used service stations can still be, 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

• 12 Nm

• Quantity: 2

2 Refrigerant Lines On Expansion Valve

3 O-ring

• 13.7 mm; 2.5 mm

4 Expansion Valve

• Removing

- Extract the refrigerant using the A/C Service Station (VAS 6007A).


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 of extraction, pressure may form in refrigerant circuit due to evaporation. Extract refrigerant once more.

- Remove the bolts item 1 => [ (Item 1) Screws ] and refrigerant pipes item 2 => [ (Item 2) Refrigerant Lines On Expansion Valve ] from the expansion valve.

- Remove the bolts item 8 => [ (Item 8) Cylindrical Combination Bolt ] 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