System Overview - Refrigerant Circuit With Expansion Valve And Receiver/Dryer

HD  = High Pressure Side

ND  = Low Pressure Side

Fig 1: Refrigerant Circuit With Expansion Valve And Receiver/Dryer Component Locations

Courtesy of AUDI OF AMERICA, LLC

1. A/C Compressor Regulator Valve -N280-
2. A/C Compressor
3. Belt Pulley
   • Depending On The Version A A/C Clutch -N25- Is Installed In The Belt Pulley. Refer To BELT PULLEY, REMOVING AND INSTALLING, A/C COMPRESSOR WITH A/C Clutch -N25- .
   • Depending On The Version Instead Of The Belt Pulley A Drive Unit Can Also Be Present. Refer To The Appropriate Service Information REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a .
4. Pressure Relief Valve
5. Refrigerant Pressure Sensor
   • Vehicle-specific version. Refer to A/C PRESSURE/TEMPERATURE SENSOR -G395-, REMOVING AND INSTALLING and HIGH PRESSURE SENSOR -G65-, REFRIGERANT CIRCUIT PRESSURE SENSOR -G805- .
6. Condenser (with Receiver/Dryer)
7. Receiver/Dryer
   • Installed on a condenser or in the condenser. Refer to RECEIVER/DRYER, REMOVING AND INSTALLING / DRYER BAG/DRYER CARTRIDGE, REMOVING AND INSTALLING , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a .
   • With Dryer Cartridge
8. Service Connection - High Pressure Side
   • With closure cap
9. Refrigerant Line with Inner Heat Exchanger
10. Front Expansion Valve
11. Front Evaporator
    • Evaporator in the front heater and A/C unit (installed under the instrument panel)
12. Service Connection - Low Pressure Side
    • With closure cap
13. Rear Expansion Valve
    • Only present in vehicles with a rear A/C unit (optional equipment)
14. Rear Evaporator
    • Only present in vehicles with a rear A/C unit (optional equipment)