A/C & Heater control Problem

That's the thermostat switch. Sounds like it may be messed up but it would be hard to tell by just the description you gave. If you are under warrenty I'd just take it to Ford.

If you are out of warrenty then you want to remove the bezel and see if there is something lodged in the switch that is causing it to act this way. The entire unit is enclosed so you might not be able to tell much about it though. A Haynes Manual is also helpful when trobleshooting problems. Even if you don't do the work yourself, at least you have an idea of what it could be before taking your car to have it worked on and just telling them to fix it. If you go in with a little knowledge it tends to keep the shops honest and not try to pull one over on you.

Now if you are having problems cooling, and it is not related to the thermostat, then you probably just need a refridgerant recharge. Most auto parts and major chain stores will carry a kit to recharge the system yourself. It helps to get one with a guage so you can see if you have a full charge on your A/C system.