Question about 2000 Mercedes-Benz S-Class
The duo-valve needs to be replaced. It controls the coolant flow to the heater core. They get stuck open or the rubber diaphram comes apart and no longer seals. In either case it allows the coolant to enter the heater core and causes hot air to blow out of the side dash vents. See if the inserts are available separately.
Posted on Oct 06, 2010
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Posted on Jan 02, 2017
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