System Diagram

Air Conditioning Vacuum Diagram:

LEGEND
1 = Evaporator housing with blower
6 = Vacuum line from vacuum pump line to brake unit
7 = Rubber hose
8 = Check valve
9 = Distributor
10 = Rubber grommet in front wall
11 = Reservoir (not used on model 123.1)
12 = Vacuum element for recirculating air flap
13 = Recirculating air flap (position fresh air)
16 = Vacuum line color code gray/light blue (not used on model 123.1)
17 = Vacuum line color code medium green/yellow
18 = Switchover valve fresh air/recirculating air (position fresh air)
20 = Vacuum hose color code black
21 = Orifice (on 123.1 models only)
F = Fresh air
U = Recirculating air
Vd = to evaporator
a = Recirculating air flap (13) in position ''recirculating air"
b = Recirculating air flap (13) in position ''fresh air"