Expansion Valve: Notes
Special tools and workshop equipment required
- Torque Wrench 5-50 Nm V.A.G 1331
- A/C Service Station VAS 6007A or newer model
- Engine Bung Set VAS 6122
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.
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 using the A/C Service Station VAS 6007A (or succeeding model).
Environmentally hazardous draining of refrigerant is an offense punishable by law.
See notes. Refer to 00 TECHNICAL DATA .
Note the safety precautions on vehicles with a start-stop system. Refer to VEHICLES WITH START/STOP SYSTEM .
Depending on engine and vehicle version, it may be necessary to loosen or to remove the following components (the upper engine cover, pressurized air pipe to throttle valve part and, depending on engine, the intake manifold, etc.).