Air Register: Description and Operation
Instrument Panel Vents and Ducts
=> [ Air Duct in Vehicle ]
=> [ Air Duct in A/C Unit ]
=> [ Connecting Elements between Temperatures Doors 1 and 2 ]
Air Duct in Vehicle
• The ventilation of the passenger compartment occurs via two air extraction outlets (in luggage compartment right and left near the bumper). Refer to => [ Vent Frame, Checking ] A/C System Control and Regulation Components.
• The following figure shows an instrument panel as installed in a sedan or Avant up to VIN "399999" of model year 2005. The form of the instrument panel in a Cabrio, sedan, or Avant starting with VIN "400000 " of model year 2005 (in the Sedan and Avant) and "012913" of model year 2005 (Cabrio) deviates slightly from this figure.
1 - Defroster vent
• For front windshield
• Removing and installing, Refer to => Interior Moulding / Trim Interior Moulding / Trim
• If the Intermediate piece between air conditioner and air duct in the instrument panel has been pinched during installation, the air guide to the front windshield is uneven or insufficient.
• Different versions of the sunlight photo sensor ( G107) in vehicles up to VIN "399999" and starting with VIN "400000" of model year 2005 (in Sedan and Avant) and to " 012912" or starting with "012913" of model year 2005 (Cabrio).
2 - Instrument panel
• Removing and installing, refer to => Interior Moulding / Trim Interior Moulding / Trim
• Different versions in a Sedan and Avant in vehicles up to VIN " 399999" and starting with VIN "400000" of model year 2005 (in Sedan and Avant) and "012912" or "012913" of model year 2005 (Cabrio).
• With the air guides to the defroster vents and instrument panel vents on the "driver and passenger side"
3 - Defroster vent
• Side window on the passenger side
• Removing and installing, Refer to => Interior Moulding / Trim Interior Moulding / Trim
4 - Instrument panel vent
• Passenger side
• Removing and installing, Refer to => Interior Moulding / Trim Interior Moulding / Trim
5 - Instrument panel vent
• Center
• Removing and installing, Refer to => Interior Moulding / Trim Interior Moulding / Trim
6 - Instrument panel vent
• Driver's side
• Removing and installing, refer to => Interior Moulding / Trim Interior Moulding / Trim
7 - Defroster vent
• Side window on the driver side
• Removing and installing, refer to => Interior Moulding / Trim Interior Moulding / Trim
8 - Defroster channel intermediate piece
• Removing and installing, refer to => [ Windshield Defroster Vent Intermediate Piece ] Instrument Panel Vents and Air Ducts
9 - Fresh air intake
• The air is taken in via the dust and pollen filter which is installed in the plenum chamber.
10 - Recirculating air intake
• The air is extracted under the glove compartment out of the passenger's side footwell.
11 - Air conditioner unit
• Heating and A/C unit, removing and installing, refer to => [ A/C Unit ] Removal and Replacement
12 - Air guide/instrument panel vent
• Center
13 - Front footwell vent
• Driver and passenger side
• Removing and installing, refer to => [ Left Front Footwell Vent ] Instrument Panel Vents and Air Ducts
14 - Intermediate piece to the air guide for the rear footwell vent
• Driver's side
15 - Intermediate piece to the air guide for the rear footwell vent
• Passenger side
16 - Air guide to the rear footwell vent
• Driver side
17 - Air guide to the rear footwell vent
• Passenger side
18 - Panel with vent openings
19 - Sealing plugs
• Only installed in vehicles without glove compartment cooling.
20 - Air guide to the glove compartment
• Only installed in vehicles with glove compartment cooling.
Air Duct in A/C Unit
• The sectional view of the A/C unit shows the flaps in the "air to footwell" position and the "cooling" temperature setting (no air through the heat exchanger for heating).
A - Driver side
B - Passenger side
C - Intake of passenger compartment air (recirculation mode)
• Via the footwell on the passenger side
D - Fresh air intake
• Via the dust and pollen filter installed in the plenum chamber
E - To the vents to the windshield (passenger side)
• The air from the center defroster vent comes from both sides of the A/C unit. Its temperature is determined by the mixture ratio depending on which temperature settings are set on the Climatronic control module (J255) A/C control head.
F - To the vents to the windshield (driver side)
• The air from the center defroster vent comes from both sides of the A/C unit. Its temperature is determined by the mixture ratio depending on which temperature settings are set on the Climatronic control module (J255) A/C control head.
G - To the instrument panel vents on the driver side
H - To the front footwell vents on the driver side
J - To the instrument panel vents in the center
• The air from these vents comes from both sides of the A/C unit. Its temperature is determined by the mixture ratio depending on which flaps are open or closed and which temperature settings are set on the Climatronic control module (J255) A/C control head.
K - To the rear footwell vent on the driver side
L - To the rear footwell vent on the passenger side
M - To the front passenger footwell vent
N - To the instrument panel vents on the passenger side
1 - Fresh Air Blower (V2)
• With Fresh Air Blower Control Module (J126)
2 - Recirculated air door
• Shown in "closed" position
3 - Fresh air flaps
• Shown in "open" position
• Both flaps are operated independently by the cam plate attached to the control motor and the actuating arm.
4 - Defroster door
• Shown in "closed" position
• Both flaps are operated together via levers attached to the outside of the air distribution housing and connecting elements.
5 - Central flap "1"
• Shown in "closed" position
• As a result of the shape of the two outside flaps, air can flow to the left and right vents when the center flap is closed.
• Both central flaps are operated independently by the cam plate attached to the control motor and the actuating arm.
6 - Central flap "2"
• Shown in the "open" position, air to the footwell vents
• Both central flaps are operated independently by the cam plate attached to the control motor and the actuating arm.
7 - Auxiliary Air Heater Heating Element (Z35)
- Not applicable for USA
8 - Heat exchanger for heater unit
9 - Temperature flaps "2"
• One flap per driver and passenger side.
• Shown in "cooling" position
• The temperature flaps "2" are operated by the connecting elements of temperature flaps "1" installed in the air distributor housing => [ Connecting Elements between Temperatures Doors 1 and 2 ].
10 - Temperature flaps "1"
• Shown in the "cooling" position
• One flap per driver and passenger side.
11 - Evaporator
Connecting Elements between Temperatures Doors 1 and 2
- A - Connecting element to the control motor for the left temperature flap (driver side)
- B - Temperature flap "1" on the driver side
- C - Connecting element on the driver side
- D - Temperature flap "2" on the driver side
- E - Connecting element on the passenger side
- F - Temperature flap "2" on the passenger side
- G - Temperature flap "1" on the passenger side
- H - Connecting element to the control motor for the right temperature flap (passenger side)
• The connecting elements between both temperature flaps "1" and " 2" are visible via the opening with the heat exchanger removed.