Spent some time using search but didnt find this... '92 300E with single temp climate control, With Engine temp @80 C, drivers floor vent has cool air mixed in when on heat. Passenger's side and both upper side vents feel good and warm. Enabling the recirc feature seems to help some. Recent very cold days make this issue much more noticeable. What should I do first to stop the cool air on the drivers side??

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RLumsde
'92 300E & '80 240D