Component Group "2"

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Fig 1: Identifying Component Group 2

Courtesy of AUDI OF AMERICA, LLC

Refrigerant Line with Inner Heat Exchanger
- In this refrigerant line, liquid warm refrigerant from the high pressure side is released into the low pressure side as flowing vaporous refrigerant energy. This increases the cooing efficiency of the A/C system.
- Refrigerant line, removing and installing. Refer to REFRIGERANT LINES WITH INNER HEAT EXCHANGER, REMOVING AND INSTALLING .
- Refrigerant line, disconnecting from quick-coupling connection and connecting. Refer to REFRIGERANT LINES, DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING .
Expansion Valve
- Refrigerant line with inner heat exchanger, disconnecting and reconnecting. Refer to REFRIGERANT LINES WITH INNER HEAT EXCHANGER, REMOVING AND INSTALLING .
- There are different versions depending on the refrigerant (R134a or R1234yf). Refer to the Parts Information.
- Removing and installing. Refer to EXPANSION VALVE, REMOVING AND INSTALLING .
  NOTE:
  From the start of production up to the changeover from MY 2012, evaporators approximately 40 mm wide (block depth) were installed (A/C unit part number "8K_ 820 005"). From MY 2012 as a running change, an evaporator with an approximately 50 mm width (block depth) is being installed depending on the vehicle version (A/C unit part number "8T_ 820 005"). Pay attention to the correct allocation of the expansion valve to the evaporator (there are different versions). Refer to the Parts Information.
Coolant Pipes to the Heat Exchanger In A/C Unit
- Coolant hoses, removing and installing; coolant circuit, bleeding. Refer to HEATER CORE, REMOVING AND INSTALLING (Heater Core, Removing and Installing).
Low Pressure Side Service Connection
- To measure and discharge the refrigerant circuit. Refer to REFRIGERANT CIRCUIT-R134a or WORKING WITH A/C SERVICE STATION .
  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 is without a valve. Refer to REFRIGERANT CIRCUIT-R134a or TECHNICAL DATA - R1234yf .
- Cap with seal, always install
- There are different versions (with primary sealing valve or with Schrader valve) depending on the refrigerant line. For distinguishing characteristics. Refer to REFRIGERANT CIRCUIT-R134a (Refrigerant R134a, Servicing; A/C System, General Information).
- There are different versions depending on the refrigerant (R134a or R1234yf). Refer to SERVICE CONNECTION DIFFERENCES, DEPENDING ON REFRIGERANT (R134A OR R1234YF) or the Parts Information.
  NOTE:
  Depending on the allocation of the service connection to the refrigerant line and vehicle version, it may be necessary to remove the left auxiliary reinforcement on the tower brace so that the A/C service station service coupling can be connected (for example, on the Audi Q5). Refer to SUSPENSION STRUT AND UPPER CONTROL ARM and REFRIGERANT CIRCUIT-R134a or WORKING WITH A/C SERVICE STATION .
Refrigerant Line Quick-Release Coupling - Low Pressure Side
WARNING:
The quick-release coupling connectors may be unlocked and opened only if the refrigerant circuit is empty.
- Refrigerant line, disconnecting from quick-coupling connection and connecting. Refer to REFRIGERANT LINES, DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING .
High Pressure Side Service Connection
- To measure, discharge and fill the refrigerant circuit, refer to REFRIGERANT CIRCUIT-R134a or WORKING WITH A/C SERVICE STATION .
  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 is without a valve. Refer to REFRIGERANT CIRCUIT-R134a or TECHNICAL DATA - R1234yf .
- Cap with seal, always install
- There are different versions (with primary sealing valve or with Schrader valve) depending on the refrigerant line. For differentiations, refer to REFRIGERANT CIRCUIT-R134a or WORKING WITH A/C SERVICE STATION .
- There are different versions depending on the refrigerant (R134a or R1234yf). Refer to SERVICE CONNECTION DIFFERENCES, DEPENDING ON REFRIGERANT (R134A OR R1234YF) or the Parts Information.
  NOTE:
  Depending on the allocation of the service connection to the refrigerant line and vehicle version, it may be necessary to remove the left auxiliary reinforcement on the tower brace so that the A/C service station service coupling can be connected (for example, on the Audi Q5). Refer to SUSPENSION STRUT AND UPPER CONTROL ARM and REFRIGERANT CIRCUIT-R134a or WORKING WITH A/C SERVICE STATION .
Refrigerant Line Quick-Release Coupling - High Pressure Side
WARNING:
The quick-release coupling connectors may be unlocked and opened only if the refrigerant circuit is empty.
Receiver/Dryer
- It may only be removed when the refrigerant circuit is empty; bring the vehicle to a workshop that has the necessary tools and in which the work can be performed by qualified personnel. Refer to REFRIGERANT CIRCUIT-R134a .
- The receiver/dryer is installed directly on the condenser. Refer to RECEIVER/DRYER, REMOVING AND INSTALLING (Receiver/Dryer, Removing and Installing).
- There are different versions. Refer to the Parts Information.
  NOTE:
  The receiver/dryer may be attached to or integrated in the condenser, depending on the version of the condenser. Refer to RECEIVER/DRYER, REMOVING AND INSTALLING and DRYER BAG/DRYER CARTRIDGE, REMOVING AND INSTALLING .
- Dryer cartridge (on a condenser with an integrated receiver/dryer), removing and installing. Refer to DRYER BAG/DRYER CARTRIDGE, REMOVING AND INSTALLING .
Condenser
- It may only be removed when the refrigerant circuit is empty; bring the vehicle to a workshop that has the necessary tools and in which the work can be performed by qualified personnel. Refer to REFRIGERANT CIRCUIT-R134a .
- There are different versions (depending on vehicle equipment level). Refer to the Parts Information.
- Refrigerant lines, removing and installing. Refer to REFRIGERANT LINES, DISCONNECTING AND CONNECTING AT CONDENSER .
- Condenser, removing and installing. Refer to CONDENSER, REMOVING AND INSTALLING .
  NOTE:
  It may be necessary to discharge the refrigerant circuit and remove the refrigerant pipes from the condenser in order to remove the condenser from the front end or to remove the radiator depending on the version of the radiator and the condenser (for example, on the Audi RS 4, Audi SQ5 and the Audi RS 5). Refer to REFRIGERANT LINES, DISCONNECTING AND CONNECTING AT CONDENSER .
A/C Pressure/Temperature Sensor -G395-
- Removing and installing. Refer to A/C Pressure/Temperature Sensor -G395-, REMOVING AND INSTALLING .
- To check the signal, use the Vehicle Diagnostic Tester in the "Guided Fault Finding" Function.
  NOTE:
  The A/C Pressure/Temperature Sensor -G395- exchanges information with the Vehicle Electrical System Control Module -J519- via the "LIN Bus". Refer to A/C Pressure/Temperature Sensor -G395-, CHECKING PRESSURE SIGNAL .
Mechanically Driven A/C Compressor
- A/C Compressor, Removing and Installing on Bracket, Vehicles with 4-Cylinder Engine and 6-Cylinder TDI Engine. Refer to A/C COMPRESSOR, REMOVING AND INSTALLING ON BRACKET .
- There are different versions depending on the refrigerant (R134a or R1234yf). Refer to the Parts Information.
  NOTE:
  On vehicles with a 6-Cylinder gasoline engine or an 8-Cylinder FSI engine, the A/C compressor can only be removed and installed at the bracket when the refrigerant circuit is discharged. Refer to A/C COMPRESSOR, REMOVING AND INSTALLING (A/C Compressor, Removing and Installing).
  
  At start of production, A/C compressors manufactured by "Denso" (type "6 SEU 14" on 4- and 6-cylinder vehicles and type "7 SEU 17" on 8-cylinder FSI vehicles) were installed. A/C compressors from different manufacturers may also be installed at a later time. Refer to the Parts Information and REFRIGERANT R134A CAPACITIES, REFRIGERANT OIL AND APPROVED REFRIGERANT OILS or TECHNICAL DATA and TECHNICAL DATA - R1234yf .
  
  For additional information. Refer to OVERVIEW - REFRIGERANT CIRCUIT .
A/C Compressor Regulator Valve -N280-
- Check activation and function. Refer to A/C Compressor Regulator Valve -N280-, CHECKING SWITCH-ON SIGNAL .
  NOTE:
  Installed only on vehicles equipped with a mechanically driven A/C compressor
  
  Certain malfunctions at the A/C Compressor Regulator Valve -N280- (for example, a stuck valve or a short circuit in the coil) can lead to a complaint regarding the A/C compressor (A/C system is not cooling, the evaporator ices over, etc.). If the A/C Compressor Regulator Valve -N280- (and not the A/C compressor itself) is the cause, the A/C compressor can be serviced by replacing the A/C Compressor Regulator Valve -N280-. Refer to REFRIGERANT CIRCUIT-R134a or TECHNICAL DATA - R1234yf .
  
  The A/C Compressor Regulator Valve -N280- is not available as a replacement part for all A/C compressors. If the A/C Compressor Regulator Valve -N280- is not available as an individual A/C compressor part (different versions), then the entire A/C compressor must be replaced. Refer to the Parts Information.