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

NOTE:

The arrows indicate the refrigerant flow direction.

The following illustration shows a refrigerant circuit with two evaporators and an internal heat exchanger as an example.

The layout of the refrigerant circuit is vehicle-specific. Refer to Air Conditioning (1 Of 3) / Air Conditioning (3 Of 3) (vehicle-specific Service Information).

HD = High Pressure Side

ND = Low Pressure Side

Fig 1: Exploded View Of Refrigerant Circuit

Courtesy of AUDI OF AMERICA, LLC

A/C Compressor Regulator Valve -N280-
A/C Compressor
Belt Pulley
- Depending on the version a A/C Clutch -N25- is installed in the belt pulley. Refer to Air Conditioning (1 Of 3) / Air Conditioning (3 Of 3) (vehicle-specific Service Information).
- Depending on the version instead of the belt pulley a drive unit can also be present. Refer to Air Conditioning (1 Of 3) / Air Conditioning (3 Of 3) (vehicle-specific Service Information).
Pressure Relief Valve
Refrigerant Pressure Sensor
- Vehicle-specific version. Refer to Air Conditioning (1 Of 3) / Air Conditioning (3 Of 3) .
Condenser (with Receiver/Dryer)
Receiver/Dryer
- Installed on a condenser or in the condenser. Refer to Air Conditioning (1 Of 3) / Air Conditioning (3 Of 3) (vehicle-specific Service Information).
- With dryer cartridge
Service Connection - High Pressure Side
- With closure cap
Refrigerant Line with Inner Heat Exchanger
Front Expansion Valve
Front Evaporator
- Evaporator in the front heater and A/C unit (installed under the instrument panel)
Service Connection - Low Pressure Side
- With closure cap
Rear Expansion Valve
- Only present in vehicles with a rear A/C unit (optional equipment)
Rear Evaporator
- Only present in vehicles with a rear A/C unit (optional equipment)