Air Flow Door Motor (V71) with Back Pressure Door Motor Position Sensor (G113)
Air Flow Door Motor (V71) with Back Pressure Door Motor Position Sensor (G113)
Special tools, testers and auxiliary items required
• Vehicle Diagnosis, Testing and Information System (VAS 5051B) (or succeeding model)
Perform the following work first:
- Turn off all electric consumers.
- Switch off the ignition.
- Remove the key.
• The Air Flow Door Motor can only be removed without difficulty in "fresh air mode stop" and installed only in this position. If motor remains standing in a different position and can no longer be moved electrically into "fresh air mode stop" position, it can only be pulled off and removed with difficulty.
• Position of fresh/recirculating air door must not be changed.
Removal
- If necessary, turn on the ignition, select "Defrost" on Front A/C display control head (E87) (control motor is always set to "fresh air mode" position in this operating mode) and wait until control motor has reached its "fresh air mode" end position.
- Switch off the ignition.
- Remove the glove compartment.
- Unclip the wiring harness from the bracket - A -.
- Open the retainers - D - and - E - and remove the bracket - A -.
- Mark the connector for the recirculation door motor (V113) (to prevent confusing it with the connector for the airflow door motor).
- Remove the recirculation door motor. Refer to => [ Recirculation Door Motor (V113) ] Recirculation Door Motor (V113).
- Remove the motor - A - from the air intake shroud.
• Connection between control motor toothed gears and air flow door is designed so that control motor can be removed without difficulty only in the "fresh air mode" position.
• If motor is found in a different position and can no longer be moved, motor cannot be simply pulled off, rather it must be loosened first with great force from mounting points - B -, ensure that toothed gear - C - is not damaged when doing this.
Installation
• Motor as replacement part is delivered in the "fresh air mode" position, only when toothed gear - A - contacts stop - B - can it then be connected onto gear of fresh/recirculating air door. If a motor was removed in a different position or activated in the removed state, it cannot be installed.
• If toothed gear - A - of motor does not stand at stop - B - "fresh air mode", proceed as follows:
- Connect the motor to the vehicle wiring harness.
- Switch on the ignition.
- Wait until the toothed gear - A - on the motor reaches the stop - B - "fresh air mode".
- Switch off the ignition.
- Before installing control motor, check bearing of air flow door in intake housing and of gear - C - (the back pressure door is open, "fresh air mode").
- Connect the airflow door motor to the vehicle wiring harness (pay attention to the correct connector order).
- Reach into intake opening for recirculating air mode and move the fresh/recirculating air door - A - into the "fresh air mode" position (intake opening for recirculating air mode is closed).
- Pull the toothed gear - D - slightly off the shaft.
- Insert the motor - B - into mounts - C - in opposite direction of arrow and onto toothed gear - D -.
• So that toothed gear on motor - A - can be slid on to toothed gear of air flow door, short tooth - C - of motor toothed gear must align with short tooth interval - D - of toothed gear on shaft of air flow door - B -.
- After installing the control motor, install the toothed gear - 1 - onto the back pressure door shaft again.
- Install the recirculation door motor. Refer to => [ Recirculation Door Motor (V113) ] Recirculation Door Motor (V113).
- Install the wiring harness so that it cannot come in contact with any moving parts (for example, the lever on the motor).
- Install the bracket - A -. When doing this, make sure the guide - B - fits correctly into the mount - C - and the bracket locks with the two retainers - D - and - E -.
• Position of air flow door motor and of recirculation door motor (and corresponding doors) is no longer visible with glove compartment installed, therefore it is advisable to check its function before installing glove compartment.
• If both toothed gears (on the air flow door motor and the air flow door) assembled in the incorrect position, air flow door will not reach its two end positions or the control motor does not run cleanly without hitching.
- Install the removed parts in the opposite order.
• Check the function of the air flow door after installing the air flow door motor.
- Checking: use the Vehicle Diagnostic Tester.
- Replacing: perform a basic setting using the Vehicle Diagnostic Tester. Refer to=> [ Checking and Adjusting Components ] Checking and Adjusting Components.