A/C issue

This is the GL wagon. My A/C works great when it works.
in order to get the A/C to work I have to set the selector to defrost wait a minute or three then switch to A/C and I will get nice cold air. But, then sometimes it will just go to warm air and I have to play with the controls to get the right sequence to start over again. What needs replacing? Interestingly I have a similar problem with the cruise control, but it works once a day! When I start out in the morning the cruise works! Until I hit the brakes then it will no longer work (until the next morning). The the same thing works fine once a day.