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Climate Control System Problems Due to Wear in Climate Control Buttons Contacts on Mercedes-Benz 300SEL

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 147,000 (147,000–147,000)
2 model years affected: 1990, 1991
3 people reported this problem
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No control of heat or blower motor speed. Full hot and no vent control. Fuses ok, switchover valves Check out,harnesses are good no trapped or shorted wires. I heard there is a soldering problem in the climate control unit.