Oct 22, 2014 #1 general patten Active Member Joined Apr 21, 2013 Messages 194 Location Hastings Car S320 limo w140 I have 1995 e220 coupe w124,my heater is just blowing cold air out on hot setting.Any ideas guys
Oct 22, 2014 #2 grober MB Master Joined Jun 22, 2003 Messages 31,753 Location Perth, Scotland Car W204 ESTATE Failure of the duovalve or the electronics controlling it. Lots of posts if you search on duovalve.