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.
Car Problem Reports
Mercedes-Benz S500 Wear in Climate Control Unit Buttons May Cause Climate Control System Failure
Mercedes-Benz S500 Problem
Average Mileage: 141,191 mi (134,574 mi - 149,000 mi)