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

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
Average mileage: 75,750 (20,000–142,000)
5 model years affected: 2006, 2007, 2008, 2009, more2010
10 people reported this problem
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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.
little to no heat at full heat setting