Failed Digital Heater Control Valve May Cause Poor Heat Output on Mercedes-Benz E55 AMG

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

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Average mileage: 66,000 (50,000–78,000)
4 model years affected: 2003, 2004, 2005, 2006
8 people reported this problem
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problem details
2004 Mercedes-Benz E55 AMG 78,000 mi,
Cold air blowing from front vents but hot from the rear. Dealer unable to figure out why. Decided to check the Benz Forum for similar problem & found that out why. Will go to different Benz dealer or Independent to resolve issue.
2006 Mercedes-Benz E55 AMG 50,000 mi,
No heat output from climate control system. Replacing the Digital Heater Control Valve solved the problem. It turned out the the original valve was completely frozen, it could even be manually manipulated to open.
Over $ 600 cost to replace. Can air works fine but no heat......