Mercedes-Benz E320 Problem Report

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

(16 reports)

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

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. -
Climate control blows cold air only no hot air -
no heat from heater -
Cool Air but no hot air coming out. -
My heater is blowing no heat just cool air... -
heater does not blow hot air only cold air -
had to change control system entirely. -
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