Expansion Valve
Expansion Valve
Special tools, testers and auxiliary items required
• Torque Wrench (V.A.G 1331/) (5 to 50 Nm)
• ROB 134APF or succeeding model.
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.
Removing
- When working on the refrigerant circuit, note the information, refer to => [ Refrigerant Circuit, Specialized Repairs ] Procedures.
• Refrigerant must be extracted before hand using ROB 134APF or equivalent.
• The previously used service stations can still be used. Refer to the 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.
• On some vehicles, connecting pipe from charge air cooler should be removed.
Only for vehicles with a heat shield in front of the expansion valve
- Remove the nut - 1 - (6 +/- 0.9 Nm).
- Remove the clamps - 2 - and the heat shield - 3 -.
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
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
- Extract refrigerant using ROB 134APF or equivalent.
Danger due to refrigerant coming out under pressure.
Danger of frost bite to skin and other parts of the body.
• Extract the refrigerant and immediately open the refrigerant circuit after that.
• If the refrigerant was extracted more than 10 minutes in the past and the refrigerant circuit was not opened, extract the refrigerant again. Pressure in the refrigerant circuit is caused by evaporation.
- Remove the bolts - 1 - and the refrigerant pipes - 2 - from the expansion valve.
- Remove the bolts - 8 - and the expansion valve - 4 -.
Installing
Install in reverse order of removal.