Notes On Front Heater And A/C Unit

There is a label -A- on the outside of the A/C unit with a part number -B- that tells which version is installed.

Fig 1: Locating A/C Unit/Distribution Housing Identification Decal

Courtesy of AUDI OF AMERICA, LLC

The part number -B- on the label -A- can be read, for example, when the CD changer is removed (depending on the vehicle equipment level). Refer to DVD/CD Changer .

Air guide in air conditioner and in vehicle. Refer to AIR GUIDE .

Air Conditioner, Removing and Installing. Refer to HEATER AND A/C UNIT, REMOVING AND INSTALLING .

A/C air intake housing, removing and installing. Refer to HEATER AND A/C UNIT AIR INTAKE HOUSING, REMOVING AND INSTALLING .

On this vehicle, the different actuators on the A/C unit are adapted and activated via a data wire. The different actuators are connected in sequence to the Climatronic Control Module -J255- A/C display and control head via this data wire (LIN Bus). The sequence differs between the different A/C unit versions. Refer to MAIN WIRING DIAGRAM FOR A/C SYSTEM ACTUATORS  and the appropriate SYSTEM WIRING DIAGRAM.

From 01/2008, A/C units which have an additional connection for the glove compartment cooling are being installed as a running change. On vehicles without glove compartment cooling, this connection is sealed with a plug. Refer to GLOVE COMPARTMENT COOLING CONNECTION ON AIR INTAKE HOUSING .

Depending on the production date, there are different versions of the levers and connecting elements on the A/C unit. Refer to Fig 2.

Revised A/C units are gradually being installed from MY 2012 (use depends on the vehicle version) (A/C unit part number "8T_ 820 005"). With the introduction of these A/C units, other actuators are also being installed. The actuator different versions can currently be installed on both A/C unit versions (interchanging is currently permitted). Use the Vehicle Diagnostic Tester in the "Guided Fault Finding"  function.

Depending on the production date, there are different versions of the levers and connecting elements on the A/C unit. Refer to Fig 2.

There are different versions of the levers and connecting elements on the A/C unit. At the start of production, the levers -A- were installed with a closed pin and the connecting rod -B-. In MY 2008, the levers -C- have a slotted pin and connecting rod -D-. When replacing, be sure to use the correct version.

Fig 2: Air Conditioner, Levers And Connecting Elements

Courtesy of AUDI OF AMERICA, LLC

On the "Basis" A/C system version, the A/C unit and the air distribution housing were not changed in 2007.

From 08/2007, the "Convenience" A/C unit versions with an air distribution housing with optimized air distribution are introduced as a running change (versions "2"). Both versions of the A/C unit can be differentiated from the outside by a decal -A- with the part number -B-.

Fig 3: Locating A/C Unit/Distribution Housing Identification Decal

Courtesy of AUDI OF AMERICA, LLC

The part number -B- on the label -A- can be read, for example, when the CD changer is removed (depending on the vehicle equipment level). Refer to DVD/CD Changer .

Pay attention to the correct allocation and adaptation of the Climatronic Control Module -J255- display and control head to the A/C unit (version "1" or "2", with and without optimized air distribution in the air distribution housing). Refer to DISPLAY AND CONTROL HEAD LOCATION (Climatronic Control Module -J255- A/C display and control head, removing and installing).