1998 Acura CL auto climate control problem

My acura cl recently does whatever it wants as far as heating and cooling goes. Sometimes when you start it up and set the temperature on 60 the heat stays on like u have it set on 90 degrees, and vise versa. It either puts out hot air or cold air, and u can't change it, all u can do is cut it completely off. It might stay on heat for a week and then decide to blow out cold air for a week. The control for where you want the heat or cold works fine, and so does the speed of the fan. When u select auto temp. The temp might read 90, but the air will be blowing out cold, it doesn't matter what u have the temp. Set on it might blow out cold or hot. Please help if u possibly can