Hi,
Last year my heater started blowing cold air out of the right foot outlet (all others blew hot). During the next several weeks one outlet after another started blowing cold until I was shivering. Turning off the heater and then turning it back on would restore warm air, but only for a minute or so.
I had the cooling system flushed and that helped - for a while. Now winter is approaching and cold air is once again blowing out of the right foot well outlet.
My local MB mechanic says it could be any number of things and wants to charge me accordingly for trouble shooting it.
Any ideas?
Thanks.

´92 MB 190E 2.3