i dropped something down the air conditioner vent need diagram please

use a shop vac... but to answer you question, it most likely fell, to the passager side.. look under, you will see the blower motor, there upside down... remove 4 screws, it will pull out, nice and light. remove the little resistor, 2 screws... small rectangle, usually has 4 wire clip to it. now you can safely stick hand in there.