Improper Temperature Output From HVAC on Mercedes-Benz 300E

One or more blend door vacuum actuators may fail resulting in the incorrect output temperature from the HVAC system. Failed actuators will require replacement to restore proper HVAC operation.

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Average mileage: 191,000 (180,000–202,000)
4 model years affected: 1990, 1991, 1992, 1993
6 people reported this problem
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I am told the dashboard has to come out and it will cost $2k to fix ........ is that correct?