audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
Removing and installing centre vent control motorV102 > < Removing and installing fresh air blower control unitJ126

A4 Mk3

Removing and installing fresh air blowerV2
Removing and installing fresh air blower -V2-
  Note
t  Different versions of the fresh air blower -V2- are available as replacement parts. Pay attention to correct assignment → Electronic parts catalogue.
   
t  As of 08.2007, fresh air blowers -V2--A- with an additional foam sheath -B- (to reduce noise) are gradually being introduced → Electronic parts catalogue.
t  As of Model Year 2009, a fresh air blower -V2--A- with a modified housing (with optimised motor and adapted motor mount) is gradually being introduced. On introduction of the modified -V2-, the additional foam sheath at the housing -B- is being discontinued. A modified insulating mat is however being installed on account of the larger motor mount (refer to Item -B- in next illustration) → Electronic parts catalogue.
t  As of Model Year 2012 and depending on the vehicle model, modified fresh air blower control units -J126-, fresh air blowers -V2-, air conditioner operating and display units, Climatronic control unit -J255- and air conditioning units are gradually to be introduced. Pay attention to the correct version and assignment of these components → Electronic parts catalogue and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
  A87-10589
t  The different versions of the air conditioning units can be distinguished from the outside by the part number -B- on the sticker -A- → Electronic parts catalogue.
t  The part number -B- on the sticker -A- can be read for example with the CD changer removed (depending on vehicle equipment) → Electrical system; Rep. gr.90.
t  In Model Year 2010, petrol engines designed for operation with bioethanol are being gradually introduced (Flex Fuel Vehicle). These engines are currently also fitted with a supplementary air heater element -Z35- → Chapter.
t  Vehicles with a high-voltage system (hybrid vehicles) and petrol engine are currently also fitted with a supplementary air heater element -Z35- → Chapter.
t  On vehicles with a petrol engine, the electric supplementary heating (supplementary air heater element -Z35-) is actuated by a signal from the operating and display unit, Climatronic control unit -J255- by way of the local data bus (via the same output by which the fresh air blower control unit -J126- is actuated) to the supplementary air heater control unit -J604-. In the event of problems with the fresh air blower control unit -J126- or the fresh air blower -V2- on these vehicles, also check the supplementary air heater control unit -J604- → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051 and → Current flow diagrams, Electrical fault finding and Fitting locations.
t  As of Model Year 2012 (introduction depending on vehicle model) modified fresh air blower control units -J126- (and fresh air blowers -V2-, air conditioner operating and display units, Climatronic control unit -J255- and air conditioning units with part number „8T_ 820 005“) are gradually being introduced. The air intake box has been modified together with -J126- and the air conditioning unit. Pay attention to the correct version and mutual assignment of these components → Electronic parts catalogue and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
t  Checking operation of supplementary air heater element -Z35- → Chapter.
Removing
  A87-10588
–  Remove the screw-type clips -A- and detach the insulating mat -B-.
  A87-10441
–  Remove the fresh air blower control unit -J126- (type -A-) → Chapter.
  Note
As of Model Year 2012 (and depending on the vehicle model) modified fresh air blower control units -J126--B- and fresh air blowers -V2- are being gradually introduced. With the modified type -B-, it is not always necessary to take out -J126- to remove -V2-.
  A87-11109
–  Release the fastener -A- and turn the housing of the fresh air blower -V2--B- in arrow direction.
  Caution
Do not grasp hold of the impeller of the fresh air blower -V2-. Applying force to the impeller or moving the balancing weights attached to the impeller could cause imbalance and thus operating problems.
Installing
Install in reverse order; paying attention to the following:
–  If the fastener -A- breaks off or is no longer strong enough, the fresh air blower -V2--B- can also be secured in the air intake box with the bolt -C-.
–  On installation, pay attention to correct positioning of the fresh air blower -V2--B- in the air intake box.
–  Switch on the ignition.
–  Interrogate the event recorder of the operating and display unit, Climatronic control unit -J255- and erase any faults displayed → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
–  To check operation, perform air conditioner final control diagnosis → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
  A87-10463

Removing and installing centre vent control motorV102 > < Removing and installing fresh air blower control unitJ126