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Mercedes-Benz 420SEL Problems

Improper Temperature Output From HVAC on Mercedes-Benz 420SEL

Problem Description and Possible Solution

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.

(2 people reported this problem)

Mercedes-Benz 420SEL Vehicles With This Problem

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Average mileage: (–)
2 model years affected: 1990, 1991
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