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

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.

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Average mileage: 147,000 (147,000–147,000)
2 model years affected: 1990, 1991
3 people reported this problem
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problem details
1991 Mercedes-Benz 300SEL 147,000 mi,
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.