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Removing and installing right heater housing (with temperature flaps) > < Removing and installing left temperature flap control motorV158

A4 Mk3

Removing and installing left heater housing (with temperature flaps)
Removing and installing left heater housing (with temperature flaps)
  Note
t  Actuation of the temperature flaps and thus the left heater housing with the temperature flaps differ for vehicles with an air conditioner of the „Deluxe“ or „Basic type“ → Chapter and → Electronic parts catalogue.
t  To maintain the stability of the air conditioning unit, only ever remove one heater housing (on left or right side) with the air conditioning unit fitted.
t  Different versions of the levers and connecting elements are fitted at the air conditioning unit depending on the production period → Chapter and → Electronic parts catalogue.
  Caution
Do not simultaneously remove the left and right heater housing.
t  The two heater housings provide support for the air conditioning unit and are therefore not to be removed simultaneously so as to maintain the stability of the air conditioning unit.
t  If necessary, successively remove and install the left and right heater housings.
Removing
–  Switch on the ignition.
–  Move the driver's seat to the rearmost position.
–  Switch off the ignition.
–  Remove the storage compartment beneath the dash panel on the driver side → General body repairs, interior; Rep. gr.70.
–  Remove the left (driver side) footwell vent → Chapter.
–  Remove the steering column → Running gear; Rep. gr.48.
–  Remove the pedal cluster and accelerator pedal module → Brakes - mechanism; Rep. gr.46 and → Fuel supply system; Rep. gr.20.
–  On vehicles with an air conditioner of the „Deluxe“ type, remove the mounting plate with the left footwell flap control motor -V108- and the left centre vent control motor -V110- as well as the left temperature flap control motor -V158- → Chapter and → Chapter.
–  On vehicles with an air conditioner of the „Basic“ type, remove the mounting plate with the footwell flap control motor -V261- → Chapter.
–  Remove the glove compartment → General body repairs, interior; Rep. gr.68.
–  Remove the right footwell vent (front passenger side) → Chapter.
   
–  So as not to damage the lever, carefully unclip the connecting rod -B- from the lever at the right temperature flap -A-.
–  Slacken off the bolt -C-.
  A87-10508
–  Slacken off or remove the bolt -F- (fitted as of 07.2007, different versions).
  Note
t  At the start of production, air conditioning units were fitted on which the left and right side of the heater housing -D- and -E- were only fastened together on the underside with the bolt -C-. As of 07.2007 air conditioning units were gradually introduced on which the two heater housings -D- and -E- are additionally fastened together with the bolt -F-.
t  Between 07.2007 and 09.2007, the bolt -F- was attached with the hexagon nut -G- to the left heater housing -D-. The left heater housing -D- is provided with a hole instead of an attachment point. With this version, removal and fitting of the bolt -F- and the hexagon nut -G- involve taking out the control motor -V68- or -V137- → Chapter.
t  The holes of the right heater housing -E- may be provided with a locking element to stop the bolt -C- (and the bolt -F-) dropping out of the hole after slackening off.
  A87-10592
–  So as not to damage the lever, carefully unclip the connecting rod -A- from the lever at the defrost flap -B-.
–  Remove the bolt -C-.
–  Pull the left heater housing -D- (with the control motors -V107- and -V68- or -V137-) out of the air conditioning unit, paying attention to the lever at the defrost flap -B- (and the lever at the centre left dash panel vent flap -E- on vehicles with an air conditioner of the „Deluxe“ type).
Installing
Install in reverse order; paying attention to the following:
  A87-10509
–  Check the groove -A- at the left heater housing -F- and the tongue at the air conditioning unit -B- for damage.
  Note
If the groove -A- at the left heater housing -F- or the tongue at the air conditioning unit -B- is damaged, seal this area with silicone adhesive sealant D176 001 A3 for example → Electronic parts catalogue.
–  Check the heat exchanger -C- and the evaporator -D- for contamination and clean these components if necessary.
–  Check the foam seals at the heat exchanger -C- and at the supplementary air heater element -Z35- (or at the honeycomb element on vehicles with no -Z35-) for damage.
–  Insert the grooves -A- at the left heater housing -F- in the tongues at the air conditioning unit -B- and slide the left heater housing -F- into the air conditioning unit.
  Note
On insertion, pay attention to the connecting rod to the right temperature flap -E- and the lever at the defrost flap -G- (as well as the lever at the centre left dash panel vent flap on vehicles with an air conditioner of the „Deluxe“ type) .
–  Re-install all the other parts removed in reverse order.
–  Switch on the ignition.
–  Perform air conditioner basic setting and final control diagnosis → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
  Note
t  The control motors on this vehicle are equipped with electronics. A new control motor only learns its position at the air conditioning unit in the course of basic setting and can then be actuated by the air conditioner operating and display unit, Climatronic control unit -J255- (all control motors are identical at present) → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
t  During basic setting, control motor assignment and adaption are implemented on the basis of the arrangement in the series connection of the wiring. If the sequence is not as specified, the matching of the control motors and thus flap control will not be correct → Chapter (block diagram of air conditioner control motors).
–  Interrogate the event recorder of the air conditioner 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.
  A87-10510

Removing and installing right heater housing (with temperature flaps) > < Removing and installing left temperature flap control motorV158