Remove screws "A". Disconnect the air duct to the right front panel deflector from the front panel cross member (do not remove).
The air duct from the air duct "B" to the right front panel deflector is secured with two bolts; to loosen it, remove only the bolt that is screwed from below into the front panel crossbar and is accessible. Remove the air duct "B" to the front panel deflector on the right (from the front passenger side).
Remove the A-pillar "C" trim and the "B" mount. Disconnect the "A" plug from the "L 26" fresh air fan control unit. If available, remove the headlight corrector control unit "J431" "1" (or adaptive lighting and headlight range control unit "J745") and the corresponding mounting frames.
Remove the supply fan "V2". The air intake box in the air conditioner can also be removed and installed with the supply fan "V2" installed, due to the limited installation space it is still advisable to remove "V2" (more freedom of movement will be achieved when removing and installing the air intake box). Remove cables "A" from the air intake box mounting points. Open the mounting "C" (between the air conditioner and the air intake box "B"), for example, using a screwdriver "D" (lift slightly and pull in the direction of the arrow).
Pull the air intake box "B" (after opening the fastening "C") from the right down (in the direction of the arrow). Mark the plugs to the air intake flap actuator "V71-E" and "F" to the recirculation flap actuator "V113" (to avoid confusion with other plugs) and disconnect them from the servomotors.
Remove the upper air conditioner tab "E" from the air intake box mount "D". Release both lower mounting points between the air conditioner "B" and the air intake box "A". Remove the air intake box.
Installation
Installation in reverse order, while it is necessary to check and, if necessary, clean the evaporator "A" and the air duct in the air conditioner to the evaporator "B". Check and, if necessary, clean the cabin filter and the air duct in the air intake box to the air conditioner "C". Check the integrity of the round groove at the air conditioner "D" and the round chamfer at the air intake box "E".
If the groove or chamfer is damaged, fill the damaged area, for example, with silicone sealant D176 001 A3. Since air can pass through here during operation of the air conditioning unit, which will cause noise. Before installing the air intake box "C", check the integrity of the seal of the outside air intake shaft "A". If necessary, replace the damaged seal. Check the position of the lock, only if the stopper "B" is in the position corresponding to the figure, you can connect the air intake box "C" and the air conditioner "D".
In accordance with the marking, connect the plugs to the air intake flap actuator "V71" "E" and to the recirculation flap actuator "V113" "F". Insert both lower tabs of the air intake box "A" into the air conditioner attachment points "B". Lift the air intake box on the right side so that the upper tab of the air conditioner "C" enters the air intake box mount "D", then squeeze both elements together. When assembling the air intake box, be careful when handling the air conditioning unit and do not apply great force. If the air intake box is connected to the air conditioning unit using force, the lower brackets of the air intake box "A" will remain deformed. Due to the deformation of the brackets of the air intake box "A", a whistling sound may occur during operation of the air conditioning unit due to minor leaks in the connection points. If the lock "E" goes forward during installation, it will not be possible to squeeze both elements together. When installing, make sure that other elements are not pinched and that the chamfer on the air intake box completely fits into the groove on the air conditioner. Move the clamp "C" against the arrow (and thus fix the air conditioner on the air intake box "B"). Install the cables "A" in the attachment points of the air intake box.
When laying cables, make sure that they do not touch the moving parts of the actuator electric motors. All removed elements are installed in the reverse order. Perform basic adjustment and diagnostics of the actuators of the climate control system. On this car, the actuator electric motors have an electronic part, the new electric motor stores its position on the air conditioner in memory only during the basic adjustment, after which it is ready to execute commands from the control and display unit of the climate control system, the Climatronic control unit "J255" (at present all electric motors are identical). During the basic setup, the actuator motors are distributed and programmed according to the distribution in the series connection. If this sequence does not correspond to the set parameters, the servomotors will store incorrect information, after which the control of the dampers will be incorrect (schematic diagram of the air conditioning system). If you are not sure that both actuators, the air intake flap actuator "V71" and the recirculation flap actuator "V113", are correctly connected to the wiring, you can check the control using the "Diagnosis of the air conditioning actuators" function, with the glove box removed, the recirculation flap "F" is visible.
[Content source: the specified website: audimanual.ru]