Freightliner Classic A/C blowing weak!!! DYING HERE

There’s 4 air piston controllers for flaps. 3 w/ single air lines. 1 on passengers side kick panel for recirculating door. 1 on drivers kick panel side for a/c vent. 1 on top in center of dash for defrost. And another with 2 air lines for vents/floor, below the defrost. Check operation of those two, when selecting controller positions. Should hear and see them move. Dash controller should have air supply going to it. If the controller doesn’t have air supply nothing will work. When the selectors moved air should go to each of the 5 lines. Maybe the controllers bad. Usually hear them leaking till finally quit working. You might have something stuck in the flaps, that fell into the defroster. Doors stuck open. No air from lines to piston valves though, might be a bad dash controller, if it has good air supply.