Failed Digital Heater Control Valve May Cause Poor Heat Output on Mercedes-Benz E350 4MATIC

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

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Average mileage: 80,171 (9,375–114,000)
6 model years affected: 2006, 2007, 2008, 2009, more2010, 2013
14 people reported this problem
4 people shared problem details
slow to produce heat in cabin, never gets what I would call hot.
Temperature reading is around 50 deg celsius. It should be around 80 deg C. Car does not heat up in cold weather.
No heat is coming out of the HVAC system, water temperature gauge is indicating <50 degrees celsius, should be around 80+
Car not heating up except for when put in max
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