Vacuum connection scheme for climate control

On the diagram, there is a circle with letters — mode selector switch

recirculation unit — on the heater blower, there is a vacuum actuator. It has two connections: upper and lower.
actuator window — located on the heating block in the upper part. Accessible near the driver's feet.
actuator legs — located on the heating block in the lower part, accessible near the driver's feet.
water valve — coolant flap under the hood for the heater.
switch hot/cold — small switch, activated by the temperature knob, located behind the climate control panel.

The air conditioner is turned on in certain modes because there is a switch inside

It looks like this by colors

To reach it, you need to remove the dashboard

Brief description of modes:
MAX COLD — recirculation, blows only into the face, air conditioner is on
AIR CON — fresh air intake from outside, blows only into the face, air conditioner is on
VENT — fresh air intake from outside, blows only into the face, air conditioner is off
BI LEVEL — fresh air intake from outside, blows in the face and at the feet, air conditioner is off
HEATER — fresh air intake from outside, blows onto the windshield and at the feet, air conditioner is off
RECIRC HEATER — recirculation, blows onto the windshield and at the feet, air conditioner is off
DEF — fresh air intake from outside, blows only on the windshield, air conditioner is off