Have an a/c issue. 2000 E350 5.4 Triton. Front a/c is blowing at an absolute minimum power only. Control switch has four speeds -low, med,med,high- but only feels like 3 currently. Airflow doesn't adjust at all- only minimum. Fuses, blower motor, and blower motor resistor have been checked and all are good. Rear a/c has never worked, only heat. Don't care about that though. What else do I need to check on the front?

 

Not quite sure of description given, but might be a good idea to check for a stuck blend door or defective blend door motor. If it is blocking air movement ,should be checked.

 

Thanks. I'll check into that.