Expansion Valve: Functions

WARNING: This page is about a different car, the 2015 Volkswagen Passat, 2014 Volkswagen Passat, 2013 Volkswagen Passat, and 2012 Volkswagen Passat. However, it is still accessible from the selected car via links, so may be relevant.

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.

NOTE:

Refrigerant must be extracted before hand using, for example Robinair A/C Service Unit ROB134APF.

The previously used service stations can still be used.

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

Fig 1: Expansion Valve Remove/Install Components

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Screws
- 12 Nm
- Quantity: 2
Refrigerant Lines on Expansion Valve
O-Ring
- 13.7 mm; 2.5 mm
Expansion Valve
- Removing and installing, refer to EXPANSION VALVE
  -- Extract refrigerant using Robinair A/C Service Unit ROB134APF.
  
  WARNING:
  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 - 1- and refrigerant lines - 2- from the expansion valve.
  
  -- Remove the bolts - 8- and the expansion valve.
O-Ring
- 14 mm; 1.82 mm
- Coat with refrigerant oil when installing
O-Ring
- 10.8 mm; 1.82 mm
- Coat with refrigerant oil when installing
O-Ring
- 9.5 mm; 2.5 mm
Cylindrical Combination Bolt
- 5 Nm