The climate control module is only showing the c and the f why? on 1996 Buick Park Avenue

I even replaced it and it is doing the exact same thing what is wrong with it or is it something else?

Asked by for the 1996 Buick Park Avenue
Sounds like it wants to know which temp. scale you want use! Got manual? Can be scanned at a repair shop.
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my 19096 buick park avenue AC blows out the defrost and floor only and will not change over to dash vents what can be done to fix
Auto or manual system: possible dash control unit, control module, actuator motor or wiring problem. Scan test required, not DIY !