Air Path and Control of Air Flaps

AIR PATH AND CONTROL OF AIR FLAPS WITH VACUUM FUNCTION DIAGRAM

The fresh air inlet is located concealed in center in front of windshield (keep free of snow). This will also reduce the influence of the dynamic air pressure as compared with model 116.






Layout of air intake with grille

The spent air from inside vehicle is routed through openings in hat rack and through ducts in trunk, as a result of which the latter will be vented and kept cooler in summer and warmer in winter. Ventilation is through openings with check valves at the left and right laterally in trunk, covered by bumper. This range - between bumper and body - is subject to a low vacuum. The design of the venting system guarantees that there is considerably less underpressure inside vehicle at high driving speeds than in model 116.






Layout of venting system with check valves (air outlet).

The following illustrations show how the individual air outlets are handled on instrument panel, as well as the air flow out of the heater box to the respective air outlets. With the exceptions of the air outlet for rear passenger compartment, the air from the remaining air outlets (a to e) can be tempered as required.






Layout of swivel inserts for air outlet-center
51 Lever for air outlet right (55)
52 Swivel inserts for air outlet-center
53 Lever for air outlet left (55)
54 Lever for center air outlet (52)






Layout of air outlets right, (mirror image for left)
55 Swivel insert for air outlets right
56 Insert for side vent right - turn wheel in upward direction = open

For rear passenger compartment the swivel insert on console for non-heatable fresh air can be additionally opened or closed as required.

Lever to the left = "open" (Fig.).






Ventilation for rear passenger compartment






a Air outlet for defroster nozzle
b Air outlet for leg and door heater
c Air outlet for side vent right
d Air outlet for for nozzle right
e Air outlet for air nozzle center
f Air outlet for nozzle rear passenger compartment vent (fresh air only)






Layout of electric switchover valves
6 Temperature sensor for heat exchanger
13 Switchover valve for center nozzle flap
14 Switchover valve for footwell flap
15 Switchover valve for defroster nozzle flaps
16 Switchover valve for vacuum elements of fresh air-recirculation air flap and main air flap (small stroke)
17 Switchover valve for vacuum elements of fresh air-recirculated air flap end main air flap (large stroke)
18 Switchover valve for diverter flap
39 Vacuum element footwell flaps
40 Vacuum element center nozzle flap
44 Orifice
45 Check valve

The vacuum elements (38 to 43) for air flaps in air conditioning unit are activated with vacuum by the electric switchover valves (13 to 18).

All switchover valves (13 to 18) are generally open for passage when energized and are directly activating all vacuum elements.






Layout of vacuum element for diverter flap and ETR-switch
29 ETR-switch
41 Vacuum element diverter flap






Layout of vacuum elements for fresh air-recirculated air flap and main air flap
19 Electronic switchgear for blower control
38 Vacuum element defroster nozzle flaps
40 Vacuum element center nozzle flap
42 Vacuum element for fresh air/recirculated air flap and main air flap
43 Vacuum element for fresh air/recirculated air flap and main air flap