Air Door: Description and Operation

Air Distribution In Air Conditioner

NOTE: The cut-away view of the air conditioner shows the flaps in the "Air routing to footwell" position and the "Cooling" temperature setting (no air through heater core).







A. Drivers side
B. Passengers side
C. Passenger compartment air intake (recirculated-air mode)
- Via passengers footwell
D. Fresh-air intake
- Via dust and pollen filter in plenum chamber
E. To windshield vents (passengers side)
- The air from the center defroster vent comes from both sides of the air conditioner; its temperature is governed by the mixing ratio arising from the temperature settings made at the operating and display module, Climatronic Control Module J255
F. To windshield vents (drivers side)
- The air from the center defroster vent comes from both sides of the air conditioner; its temperature is governed by the mixing ratio arising from the temperature settings made at the operating and display module, Climatronic Control Module J255
G. To instrument panel vents, drivers side
H. To front footwell vent, drivers side
J. To instrument panel vents, center
- The air from these vents comes from both sides of the air conditioner; its temperature is governed by the mixing ratio arising from the temperature settings made at the operating and display module, Climatronic Control Module J255 and depending on which flaps are open or closed
K. To rear footwell vent, drivers side
L. To rear footwell vent, passengers side
M. To front footwell vent, passengers side
N. To instrument panel vents, passengers side

1 - Fresh Air Blower V2
- With Fresh Air Blower Control Module J126
2 - Recirculated-air flap
- Shown in "closed" position
3 - Fresh-air flaps
- Shown in "open" position
- The two flaps are activated independently via the cam plate and actuating arms installed to the control motor.
4 - Defroster flap
- Shown in "closed" position
- The two flaps are jointly activated by way of levers and coupling elements installed to the outside of the air distributor housing.
5 - Central flap "1"
- Shown in "closed" position
- The shape of the two outer flaps is such that air can flow to the left and right vents with the central flap closed.
- The two central flaps are activated independently via the cam plate and actuating arms installed to the control motor.
6 - Central flap "2"
- Shown in "open" position, air routing to footwell vents
- The two central flaps are activated independently via the cam plate and actuating arms installed to the control motor.
7 - Auxiliary Air Heater Heating Element Z35
- Not installed on USA vehicles.
8 - Heating core
9 - Temperature flaps "2"
- One flap each for drivers and passengers side
- Shown in "cooling" position
- The temperature flaps "2" are activated by the temperature flaps "1" by way of coupling elements in the air distributor housing.
10 - Temperature flaps "1"
- Shown in "cooling" position
- One flap each for drivers and passengers side
11 - evaporator