Mercedes-Benz E350 4MATIC Problem Report

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

(14 reports)

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

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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