Audi Q7: Fresh Air Door Motor -V438- Function, Removing and Installing
Fresh Air Door Motor -V438-, Removing and Installing
Note
- Therefore, perform the basic setting for the A/C system
after installation of the adjustment motor. Refer to Vehicle
Diagnostic Tester in the "Guided Fault Finding" function.
- Using the "output diagnostic test mode" and "basic setting"
functions, the activation of A/C system electrical components
can be tested if necessary (for example, allocation test). Refer
to Vehicle Diagnostic Tester in the "Guided Fault Finding"
function.
- Currently in this vehicle, all actuators are identical in
construction. During the basic setting, the actuators are
assigned and adapted corresponding to the switching sequence of
the wiring. If this sequence does not conform with the
specification, the actuators will adapt incorrectly and the door
control will be wrong. Refer to
→ Chapter "Main Wiring Diagram for A/C System Actuators".
- After installing a new control motor, check the activation
through the Front A/C Display Control Head -E87-, and the
function of the actuator (correct position of the recirculation
door and the back pressure/fresh air door). Refer to Vehicle
Diagnostic Tester in the "Guided Fault Finding" function.
- Fresh Air Door Motor -V438- function. Refer to
→ Chapter "Fresh Air Door Motor -V438- Function".
Removing
- Move the right front seat (front passenger seat) as far back
as possible.
- Turn off the ignition.
- Remove screw clips -A-.
- Loosen the insulation -B- from
the heater and A/C Unit air intake housing and remove.
Caution
A/C system malfunctions in the case of interchanged
control motors and/or connectors. Refer to
→ Chapter "Main Wiring Diagram for A/C System Actuators".
- The adjustment motors and connectors are identical.
If they are installed or connected incorrectly, the
corresponding doors cannot be properly adapted and/or
activated.
- Clearly label the actuators and connectors prior to
removal to prevent incorrect installation.
- Label the connector -C- (to
prevent a mix up if several connectors are disconnected at the
same time).
- Remove the bolts -A-.
- Remove the actuator -B- from
the door shaft -D-.
- Disconnect the connector -C-.
Installing
Install in reverse order of removal. Note the following:
- Check the fasteners and lever to the doors
-A, B and C- for proper assembly
and ease of movement.
Caution
If the mount -B- for
the actuator -C- is turned
by hand, then the electronics in the actuator can be
damaged.
Note
The actuator mount does not have a stop. It turns constantly
if the actuator is activated. Therefore, this should not be
activated with the adjustment motor removed.
- Check the shaft -A- and the
mount -B- for the actuator
-C-. They must be properly aligned
so that they can be joined.
- Attach the actuator mount -B-
to the door shaft -A-.
Note
Check the connection between the actuator mount and the
shaft; there must not be any play.
- Connect the connector -C-.
- Tighten the bolts -A-.
- Route the wiring harness to the connector
-C- so that it cannot come in
contact with any moving parts.
- Perform the basic setting and the output diagnostic test
mode of the A/C system. Refer to Vehicle Diagnostic Tester in
the "Guided Fault Finding" function.
Note
- In this vehicle, the actuators are equipped with
electronics. During the basic setting, a new control motor
learns its position on the heater and A/C unit and can then be
activated by the Front A/C Display Control Head -E87- (currently
all actuators are identical). Refer to 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 with the specification, the
actuators will adapt incorrectly and the door control will be
wrong. Refer to
→ Chapter "Main Wiring Diagram for A/C System Actuators".
- Check the DTC memory on the Front A/C Display Control Head
-E87- and erase any displayed malfunctions. Refer to Vehicle
Diagnostic Tester in the "Guided Fault Finding" function.
Fresh Air Door Motor -V438- 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 the cover over fresh air intake. Refer to
→ Chapter "Fresh Air Intake, Removing and Installing").
- For air flow regulation, the fresh air intake channel is
closed partially via the back pressure door when at a high
vehicle speeds (from approximately 80 km/h) by the Front A/C
Display Control Head -E87- (the position of the recirculation
door is specified by the Front A/C Display Control Head -E87-).
- To reduce the change in noise from the Fresh Air Blower -V2-
due to the different air intake when switching from fresh air to
recirculating air mode or vice versa, Fresh Air Door Motor
-V438- and the Recirculation Door Motor -V133- are activated as
follows:
- When switching from fresh air to recirculating air mode, the
air recirculation door is opened first, then the fresh air
intake duct is closed via the back pressure/fresh air door.
- When switching from recirculating to fresh air mode, the
fresh air intake duct is first opened via the back
pressure/fresh air door, then the air recirculation door is
closed.
- In partial recirculation mode, the air recirculation opens
and the back pressure/fresh air door is brought into a center
position by the Front A/C Display Control Head -E87- (the fresh
air and recirculation air intake duct are opened slightly at the
same time). This achieves improved cool-off in certain
temperature ranges and simultaneously draws in a certain portion
of fresh air as well.
READ NEXT:
Note
Currently in this vehicle, all actuators are identical in
construction. During the basic setting, the actuators are
assigned and adapted corresponding to the switching sequence of
th
Note
Depending on vehicle equipment, there are different versions of the
A/C system for the Audi Q7. Make sure to use the correct version and pay
attention to the allocation of different
Note
Therefore, perform the basic setting for the A/C system
after installation of the adjustment motor. Refer to Vehicle
Diagnostic Tester in the "Guided Fault Finding" function.
Using t
SEE MORE:
Special tools and workshop equipment
required
Generator Belt Socket -3310-
Inner hex socket 8 mm or TORX
T50
Removing
- Remove the generator if necessary. Refer to
→ Electrical Equipment; Rep. Gr.27; Generator; Generator,
Removing and Installing.
- For some engine t
Overview - Release in Vehicle Interior
1 - Operating Lever
For the latch
Removing and Installing. Refer to
→ Chapter "Latch Release Lever, Removing and Installing".
2 - Bolt
2 Nm
Quantity: 2
3 - Mounting Bracket
For latch release lever
Removing and