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: 82,837 (9,375–126,500)
6 model years affected: 2006, 2007, 2008, 2009, more2010, 2013
18 people reported this problem
6 people shared problem details
Temperature reading is around 50 deg celsius. It should be around 80 deg C. Car does not heat up in cold weather.
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
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