Testing Check Valve and Vacuum Reservoir

Note: Except model 126.120.

a) Testing Check Valve:






1. Pull vacuum line color code red-green from check valve (36).
2. Connect vacuum line of tester (refer to arrow), evacuate and read pressure gauge.
3. If gauge shows a pressure increase, replace check valve (36).

b) Testing Vacuum Reservoir:






4. Pull vacuum line (b) color code red/gray Out of connection.
5. Connect vacuum line of tester (refer to arrow) to vacuum line (b) and evacuate.






6. If readout on gauge changes, replace gasket of vacuum reservoir (97) or replace vacuum reservoir.

Vacuum Function Diagram Automatic Climate Control, Function Selection "a" (defrosting):






13 Switchover valve for center nozzle flap
14 Switchover valve for footwell flaps
15 Switchover valve for defroster nozzle flaps
16 Switchover valve for vacuum elements of fresh air-recirculated air flap and main air flap (small stroke)
17 Switchover valve for vacuum elements of fresh air-recirculated air flap main air flap (large stroke)
18 Switchover valve for diverter flap
35 Vacuum connection on intake pipe
36 Check valve
37 Vacuum reservoir
38 Vacuum element for defroster nozzle flaps (flaps "open")
39 Vacuum element for footwell flaps (flaps "closed")
40 Vacuum element for center nozzle flap (flap "closed")
41 Vacuum element for diverter flap (flap "closed")
42 Vacuum element for fresh air-recirculated air flap and main air flap (flap "open", 100% fresh air supply)
43 Vacuum element for fresh air-recirculated air flap and main air flap (flap "open", 100% fresh air supply)
44 Orifice
45 Check valve
45 7-point distributor
49 4-point distributor
50 3-point distributor