The climate control system can fail or perform erratically due to internal problems with the climate control button electrical contacts. Replacement of the climate control assembly is commonly required to correct this problem.
Climate Control System Problems Due to Wear in Climate Control Buttons Contacts on Mercedes-Benz S420
Average mileage: 111,539 (88,546–153,152)
11 people reported this problem
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Wear of buttn to increase temperature on driver side,wear of button to increase/decreaser fan and wear on button to select upper/middle/lower vents
Buttons take several pushes to engage. After a few months of this, the buttons work fine and on first press
The button to control the temperature up or down do not work.
The climate control module cuts off and on by itself and sometimes buttons will not work to change to different modes.