air condition is blowing warm air on 1998 Mazda B2500

checked the refigerant pressure and added one can and it still blows warm air.

Asked by for the 1998 Mazda B2500
I have the same problem and found a shop that gave me an estimate at no charge, if you can believe that. He said the blend door is not opening and closing like it should, that it had a bad actuator. The glove box needed to be removed to fix it. Then there's another part that is square and fits into a square hole and if that part is broken, the entire dashboard needed to be removed. Worst case scenario, it could cost me as much as $600 to repair it. Needless to say, I'm looking forward to cooler weather. Please reply if you have found a solution, as it might help me out...