Failed Digital Heater Control Valve May Cause Poor Heat Output on Mercedes-Benz E350

A failed digital heater control valve can cause a lack of heat output from the climate control system.

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Average mileage: 75,750 (20,000–142,000)
5 model years affected: 2006, 2007, 2008, 2009, more2010
9 people reported this problem
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problem details
2006 Mercedes-Benz E350 142,000 mi,
The heater in my 2006 E-350 no longer blows warm/hot air. This was at first an issue that appeared to me to be an anamoly, but it worsened until the heater no longer worked.
2008 Mercedes-Benz E350 64,000 mi,
little to no heat at full heat setting