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
     CAUTION:

     Danger due to refrigerant coming out under pressure when there is a faulty valve in the refrigerant circuit.

     Danger of frost bite to skin and other parts of the body.

     • Only remove when the refrigerant circuit is empty; the connection does not have a valve. Refer to SYSTEM OVERVIEW - REFRIGERANT CIRCUIT [R1234yf] / GENERAL DESCRIPTION - REFRIGERANT CIRCUIT COMPONENTS [R1234yf] / A/C SYSTEM, GENERAL INFORMATION or SYSTEM OVERVIEW - REFRIGERANT CIRCUIT [R1234yf] / GENERAL DESCRIPTION - REFRIGERANT CIRCUIT COMPONENTS [R1234yf] .
   • There are different versions depending on the refrigerant (R134a or R1234yf). Refer to SERVICE CONNECTION DIFFERENCES, DEPENDING ON REFRIGERANT (R134A OR R1234YF) .
4. Closure Cap
   • With seal
   • Always screw on
   • There are different versions depending on the refrigerant (R134a or R1234yf). Refer to SERVICE CONNECTION DIFFERENCES, DEPENDING ON REFRIGERANT (R134A OR R1234YF) .
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 depending on the refrigerant (R134a or R1234yf).
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
     CAUTION:

     Danger due to refrigerant coming out under pressure when there is a faulty valve in the refrigerant circuit.

     Danger of frost bite to skin and other parts of the body.

     • Only remove when the refrigerant circuit is empty; the connection does not have a valve. Refer to SYSTEM OVERVIEW - REFRIGERANT CIRCUIT [R1234yf] / GENERAL DESCRIPTION - REFRIGERANT CIRCUIT COMPONENTS [R1234yf] / A/C SYSTEM, GENERAL INFORMATION or REFRIGERANT CIRCUIT COMPONENTS, REPLACING [R1234yf] .
   • There are different versions depending on the refrigerant (R134a or R1234yf). Refer to SERVICE CONNECTION DIFFERENCES, DEPENDING ON REFRIGERANT (R134A OR R1234YF) .
10. Closure Cap
    • With seal
    • Always screw on
    • There are different versions depending on the refrigerant (R134a or R1234yf). Refer to SERVICE CONNECTION DIFFERENCES, DEPENDING ON REFRIGERANT (R134A OR R1234YF) .