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check the knobs, soo if they are broken on the inside of them, they pull off....if not check the heater hose control, i know mine was stuck and snapped on my 91 accord and i had to move it by hand and now all i get it hot air no matter which way i move my temp knob, which is fine because ihave windows if im hot and i cut my AC lines when i put in my h22a.....if they are good check your heater core, that could be the problem also, do you smell antifreeze in your car or does you floor get wet and stink or anything like that?