Climate Control System Problems Due to Wear in Climate Control Buttons Contacts on Mercedes-Benz S500

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: 142,959 (134,574–149,000)
6 model years affected: 1994, 1995, 1996, 1997, more1998, 1999
10 people reported this problem
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problem details
when putting on the ac or heater it it only blows to the top of the windshield and bottom to the feet but never straight to ahead,what could be going on somebody please let me know what could be the problem.( thank you).