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: 77,634 (9,375–126,500)
6 model years affected: 2006, 2007, 2008, 2009, more2010, 2013
20 people reported this problem
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problem details
Temperature reading is around 50 deg celsius. It should be around 80 deg C. Car does not heat up in cold weather.
Freezing cold inside-diagnosed at the dealer-replaced at local shop for less-$250
When cutting on my heat inside the car,at a sudden point a noise comes from the car vent, sound it makes it sound like a cricket.
heat readings is less than it should be i have yellow light check engine on heats is not strong enough in the cabin
slow to produce heat in cabin, never gets what I would call hot.
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