A/C Push-Button Control Unit
WARNING: This page is about a different car, the 1999 Mercedes-Benz CLK430, 1999 Mercedes-Benz CLK320, and 1998 Mercedes-Benz CLK320. However, it is still accessible from the selected car via links, so may be relevant.
Sensor signals and temperature settings are processed in A/C push-button control unit (A/C-heater control panel). The unit controls coolant flow through heater valve, mode change (heating to cooling) and position of fresh/recirculated air door. The control unit signals blower control unit of required or selected blower motor speed.