100% Recirculated Air

Air volume switch (S3) at blower stage 1 and fresh/recirculated air switch on,
Fresh-recirculated air flap set for 100 % recirculated air

S3 Air volume switch
Y13/1 Switch-over valve connector block fresh/recirculated air flap, 2-fold
y1 Switchover valve for fresh/recirculated air flap (long stroke)
y2 Switchover valve for fresh/recirculated air flap (short stroke)
30 Vacuum connection at intake manifold
31 Non-return valve
32 Vacuum reservoir
33 Left vacuum element for fresh/recirculated air flap
34 Right vacuum element for fresh/recirculated air flap

Color Code For Vacuum Lines:
mgn median green
hbl light blue
drt dark red
gn green
rt red
gr gray
ws white