Blend flap vacuum element, function - GF83.10-P-2118-01B
WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.
Function
The blend flap vacuum elements (45, 46) are actuated automatically with the valve block (Y11) via the control pushbutton module depending on the temperature in the heater core.
In the open state vacuum is present at the blend flap vacuum elements (45, 46).
When changing from cooling mode to heating mode or vice versa (mode change) the blend flaps are opened for a short time.
Manual hot/cold switchover on center nozzle
If the hot" button on the center nozzle is pressed, the blend flaps are opened regardless of the temperature in the heater core. Pressing the hot" button again reactivates the automatic mode for the blend flaps.
If the cold" button is pressed in the hot" mode the blend flaps close.