Overview - Heater And A/C Unit Air Intake Housing

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NOTE:

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 . Therefore, ensure the correct allocation of the right radiator housing and air intake housing .

The following illustration shows the upper section of the air intake housing without a connection for the glove compartment cooling.

From MY 2012 (introduction depending on the vehicle version), a revised Fresh Air Blower Control Module -J126- (and Fresh Air Blower -V2-, Climatronic Control Module -J255- A/C display and control head, evaporator, expansion valves, actuators and A/C units are being used . Use the Vehicle Diagnostic Tester in the "Guided Fault Finding " function. Read all the information regarding these components. Refer to OVERVIEW - FRONT ACTUATORS, "Basis" VERSION .

-- Remove the air intake housing. Refer to HEATER AND A/C UNIT AIR INTAKE HOUSING, REMOVING AND INSTALLING .

Fig 1: Identifying A/C Unit Air Intake Housing Assembly

Courtesy of AUDI OF AMERICA, LLC

Foam Seal
- For sealing the fresh air intake duct to the vehicle; bonded to the air intake duct
Air Intake Duct
- With back pressure-, fresh air- and air recirculation door
- Do not disassemble further
- From the air intake housing, removing and installing. Refer to AIR INTAKE DUCT, REMOVING AND INSTALLING .
Curved Washer
- Actuated by two levers, the back pressure- and fresh air door
- Lightly coat the curved washer guides as well as the pins at the door levers with lubricant (for example, Lubricant G 000 150).
Airflow Door Motor -V71-
- Removing and installing. Refer to Airflow Door Motor -V71-, REMOVING AND INSTALLING .
Bolt
Recirculation Door Motor -V113-
- Removing and installing. Refer to Recirculation Door Motor -V113-, REMOVING AND INSTALLING .
Latch
- To lock the air intake housing to the A/C
Upper Part of the Air Intake Housing
- Do not dismantle
  NOTE:
  Depending on the version of the Original part, the upper and lower sections are attached to each other by screws or the upper section is welded to the lower section.
  
  Current, as a replacement part, the air intake housing is delivered as a single part. Assemble both sections together and use the screws, refer to -item 5- "Bolt" to connect the two sections together -item 17- "Attaching Point" .
- If one of the retaining tabs, refer to -item 16- "Catches on the Upper Part of the Air Intake Housing" has broken off or if one of the welded points no longer holds, both housing parts can be bolted together with screws, refer to -item 5- "Bolt".
- There are different versions (with and without a connection for glove compartment cooling), this illustration shows the version without the connection .
Lower Part of the Air Intake Housing
- Do not dismantle
  NOTE:
  Depending on the version of the Original part, the upper and lower sections are attached to each other by screws or the upper section is welded to the lower section.
  
  Current, as a replacement part, the air intake housing is delivered as a single part. Assemble both sections together and use the screws, refer to -item 5- "Bolt" to connect the two sections together -item 17- "Attaching Point" .
- If one of the retaining tabs, refer to -item 16- "Catches on the Upper Part of the Air Intake Housing" has broken off or if one of the welded points no longer holds, both housing parts can be bolted together with screws, refer to -item 5- "Bolt".
  From MY 2012, a new version is being used. Read all the information regarding this component. Refer to OVERVIEW - FRONT ACTUATORS, "Basis" VERSION .
Fresh Air Blower -V2-
- Removing and installing. Refer to Fresh Air Blower -V2-, REMOVING AND INSTALLING .
- To check, use the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.
  NOTE:
  From 08/2007 as a running change, the Fresh Air Blower -V2- is installed with an additional foam jacket on the housing (as noise insulation). Refer to Fresh Air Blower -V2-, REMOVING AND INSTALLING .
  
  As a running change from MY 2009, a Fresh Air Blower -V2- with a revised housing with an optimized motor and motor mount, is being installed. The new Fresh Air Blower -V2- does not have the foam jacket on the housing because the larger motor mount. However, revised insulation is installed. Refer to -item 14- "Insulation" .
  
  As a running change in MY 2010, gasoline engines that can run on bioethanol (Flex Fuel vehicles) were introduced, which currently have an Auxiliary Heater Heating Element -Z35-. Refer to Auxiliary Heater Heating Element -Z35-, CHECKING .
  
  Currently an Auxiliary Heater Heating Element -Z35- is also installed on vehicles with a high voltage system (hybrid vehicles) and a gasoline engine. Refer to Auxiliary Heater Heating Element -Z35-, CHECKING .
  
  For vehicles with a gasoline engine, the electric auxiliary heater (the Auxiliary Heater Heating Element -Z35-) is activated by the Climatronic Control Module -J255- display and control head via the local Data Bus (activated via the same outlet and also via the Fresh Air Blower Control Module -J126-) on the Auxiliary Air Heater Control Module -J604-. Also check the Auxiliary Air Heater Control Module -J604- if there is a concern about the Fresh Air Blower Control Module -J126- or the Fresh Air Blower -V2- for these vehicles. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding " function and refer to appropriate SYSTEM WIRING DIAGRAM.
  
  Check the Auxiliary Heater Heating Element -Z35- function. Refer to Auxiliary Heater Heating Element -Z35-, CHECKING .
  
  From MY 2012 (depending on the vehicle version), a revised Fresh Air Blower Control Module -J126-, Fresh Air Blower -V2-, Climatronic Control Module -J255- A/C display and control head and A/C units are gradually being used. Be sure to use the correct version and allocation. Refer to the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.
  
  If the allocation or adaptation of the Climatronic Control Module -J255- to the Fresh Air Blower Control Module -J126- (with the part number 8K0 820 521 or 8T0 820 521) is not according to the specification, then the Fresh Air Blower -V2- is not regulated by the Fresh Air Blower Control Module -J126-. There may not always be an entry in the DTC memory even though the activation of the Fresh Air Blower -V2- is not OK. Make sure the Climatronic Control Module -J255- is adapted correctly. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.
  
  From MY 2012, a new version is being used. Read all the information regarding this component. Refer to OVERVIEW - FRONT ACTUATORS, "Basis" VERSION .
Fresh Air Blower Control Module -J126-
- Removing and installing. Refer to Fresh Air Blower Control Module -J126-, REMOVING AND INSTALLING .
- To check, use the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.
  NOTE:
  As a running change in MY 2010, gasoline engines that can run on bioethanol (Flex Fuel vehicles) were introduced, which currently have an Auxiliary Heater Heating Element -Z35-. Refer to Auxiliary Heater Heating Element -Z35-, CHECKING .
  
  Currently an Auxiliary Heater Heating Element -Z35- is also installed on vehicles with a high voltage system (hybrid vehicles) and a gasoline engine. Refer to Auxiliary Heater Heating Element -Z35-, CHECKING .
  
  For vehicles with a gasoline engine, the electric auxiliary heater (the Auxiliary Heater Heating Element -Z35-) is activated by the Climatronic Control Module -J255- display and control head via the local Data Bus (activated via the same outlet and also via the Fresh Air Blower Control Module -J126-) on the Auxiliary Air Heater Control Module -J604-. Also check the Auxiliary Air Heater Control Module -J604- if there is a concern about the Fresh Air Blower Control Module -J126- or the Fresh Air Blower -V2- for these vehicles using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function and refer to appropriate SYSTEM WIRING DIAGRAM.
  
  Check the Auxiliary Heater Heating Element -Z35- function. Refer to Auxiliary Heater Heating Element -Z35-, CHECKING .
  
  From MY 2012 (use depends on the vehicle version), a revised Fresh Air Blower Control Module -J126- (and Fresh Air Blower -V2-, Climatronic Control Module -J255- A/C display and control head and A/C units with part number "8T_ 820 005") are gradually being used. The air intake housing, along with the Fresh Air Blower Control Module -J126- and the A/C unit was also revised. Be sure to use the correct version and allocation . Use the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.
  
  From MY 2012, a new version is being used. Read all the information regarding this component. Refer to OVERVIEW - FRONT ACTUATORS, "Basis" VERSION .
Dust and Pollen Filter
- Removing and installing. Refer to DUST AND POLLEN FILTER, REMOVING AND INSTALLING .
- Follow the replacement intervals. Refer to Maintenance Tables.
- Different versions with and without activated charcoal filter element. Refer to DUST AND POLLEN FILTER WITH ACTIVATED CHARCOAL INSERT, ELEMENT INFORMATION .
Cover for Dust and Pollen Filter
- Removing and installing. Refer to DUST AND POLLEN FILTER, REMOVING AND INSTALLING .
Insulation
- Removing and installing. Refer to DUST AND POLLEN FILTER, REMOVING AND INSTALLING .
- Different versions, depending on the version of the Fresh Air Blower -V2-. Refer to -item 10- "Fresh Air Blower -V2-" .
Screw Clips
Catches on the Upper Part of the Air Intake Housing
Attaching Point