Inner heat exchanger, expansion valve, evaporator, service connections

HD = high pressure side

ND = low pressure side

Courtesy of AUDI OF AMERICA, LLC

1. Refrigerant Line with Inner Heat Exchanger
   • Installed in the area under the left fender
   • In this refrigerant line, the liquid warm refrigerant flowing on the high pressure side releases energy into the vaporous cold refrigerant flowing on the low pressure side. This increases the efficiency of the A/C system.
2. Refrigerant Line Pass-Through
   • From the area under the left fender in the plenum chamber
3. High Pressure Side Service Connection
   • For measuring, discharging and charging
   • Installed in the left plenum chamber (near the brake fluid reservoir) under the plenum chamber cover
   • There are different versions. Refer to the Parts Information.
4. Closure Cap
   • With seal
   • Always screw on
   • There are different versions. Refer to the Parts Information.
5. Refrigerant Line to High Pressure Side Expansion Valve
6. Front Expansion Valve
   • Overview. Refer to OVERVIEW - COMPONENTS UNDER FENDER AND IN PLENUM CHAMBER .
   • There are different versions. Refer to the Parts Information.
7. Evaporator
   • In the heater and A/C unit (installed under the instrument panel)
8. Refrigerant Line to Low Pressure Side Expansion Valve
9. Low Pressure Side Service Connection
   • For measuring, discharging and charging
   • Installed in the left plenum chamber (near the brake fluid reservoir) under the plenum chamber cover
   • There are different versions. Refer to the Parts Information.
10. Closure Cap
    • With seal
    • Always screw on
    • There are different versions. Refer to the Parts Information.