My climate control seems to work properly in Total Ventilation and defrost mode but not in the other two. In Normal and Economy the footweel vents do not open and the temperature wheel seems not to work. I can get full heat or no heat only in these modes out the defrost and side vents with cool air out the center vents. The car is a 1981 300TDt. Do you think I need a new push putton controller?

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Brian Roth, Pollock Pines, CA
1981 300TD turbo diesel on 1984 Nissan 4x4 chassis. A runner.
1973 Porsche 914 with Ford 2.3 turbo. Not a runner yet.