1994 a/c controls not working....display show 2 dashes?
 

hello all.....i have a 1994 vette..only 40k on her and allways garaged....
the a/c controls are locked in on defrost and floor venting with nice cold air...and on the display it has a dot and 2 dashes......nothing works on the buttons....i can go into the adjustment mode and scroolll through.....i tookit out and cleaned all the contacts.....but thats not fixing it.....
any ideas?...thanks in advance..
Jeff