Failed Digital Heater Control Valve May Cause Poor Heat Output on Mercedes-Benz E320

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
Average mileage: 72,250 (40,000–91,000)
3 model years affected: 2003, 2004, 2005
15 people reported this problem
Viewing 1 - 7 of 7 comments
This is a small cheap part that costs about $100 to replace. Try this - under the hood, on the left side of the vehicle (as you look forwards) there's a plastic cover over the bulkhead behind the brake reservoir. Give it a healthy slap. Try your heater.