Airflow Door Motor -V71-, REMOVING AND INSTALLING: Installing

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Installation is carried out in the reverse order while observing the following.

-- Check the lever for the back pressure door -D- and for the fresh air door -E- ; they must fit correctly in the curved washer -A-.

-- Insert the actuator shaft -C- into the curved washer mount -A-.

NOTE:

The actuator does not have a stop; therefore, the actuator shaft -C- can be inserted into the curved washer mount -A- in any position.

-- Install the bolts -B-.

-- Install the removed parts in the opposite order.

-- Perform a basic setting and the output diagnostic test mode for the A/C system using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.

NOTE:

On this vehicle, the actuators are equipped with electronics. During the basic setting, a new actuator learns its position on the A/C unit and can then be activated by the Climatronic Control Module -J255- A/C display and control head (currently all actuators are identical) using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

During the basic setting, the actuators are assigned and adapted corresponding to the switching sequence of the wiring. If this sequence does not conform the specification, the adjustment motors will adapt incorrectly and the door control will be wrong. Refer to MAIN WIRING DIAGRAM FOR A/C SYSTEM ACTUATORS (A/C system actuators block diagram).

-- Check the DTC memory for the Climatronic Control Module -- A/C display and control head and erase any displayed malfunctions, if necessary using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

Airflow Door Motor -V71- function

The position of the fresh air- and back pressure door is visible via the air intake opening in the plenum chamber when the air recirculation is closed (if necessary, remove the plenum chamber cover and cover over fresh air intake. Refer to FRESH AIR INTAKE, REMOVING AND INSTALLING ).
For back pressure regulation, the fresh air intake duct is closed partially via the back pressure door at a higher vehicle speed (from approximately 80 km/h (50 mph)) by Climatronic Control Module -J255- A/C display and control head (position of recirculating air door is specified by the Climatronic Control Module -J255- A/C display and control head).
To reduce the change in noise of the Fresh Air Blower -V2- due to different air intake when switching from fresh air to recirculating air mode or vice versa, the Airflow Door Motor -V71- and the Recirculation Door Motor -V133- are activated as follows:

-- When switching from fresh air to recirculation mode, the recirculation door is first opened, then the fresh air intake channel is closed via the back pressure and fresh air door.

-- When switching from recirculation to fresh air mode, the fresh air intake channel is first closed by the back pressure/fresh air door, then the recirculation door is closed.

-- In partially air recirculation mode, the air recirculation door -E- is opened and back pressure-/fresh air door is brought into a center position by the Climatronic Control Module -J255- A/C display and control head (fresh air and air recirculation air intake duct are slightly opened simultaneously). This achieves improved cool-off in certain temperature ranges and simultaneously draws in a certain portion of fresh air as well.