Acc Push-Button Control Unit
WARNING: This page is about a different car, the 1997 Mercedes-Benz E420, 1997 Mercedes-Benz E320, and 1997 Mercedes-Benz E300. However, it is still accessible from the selected car via links, so may be relevant.
Sensor signals and temperature settings are processed in ACC push-button control unit (A/C-heater control panel). The control unit controls coolant flow through heater valve, mode change (heating to cooling) and position of fresh/recirculated air door. The control unit signals blower speed control unit.