2003 Ford Taurus Heater not working on all settings

Heater problem
2003 Ford Taurus 6 cyl Wheel Drive Type unknown Automatic 61000 miles

My heater has 4 settings and when I turn it on to settings one through 3 I get very minimal air flow. When I turn it up to the last setting I get good air flow but it makes a wierd noise like somthing is rubbing or lose. The problem isn't just exclusive to the heating but also when I turn on the a/c or defroster. I don't want to run it in fear of damaging it but also get very very cold. Please help.