air not blowing at me only floor & top Dash back seat vent on 1995 Buick Riviera

1995 Buick rivera super charge, a year ago could hear a tick in dash, recently had work done on the car, they did unhook Battery. Now AC only blows top dash and floor and back seat vents on at me . I can still hear the tick, after a few seconds it stops. how can I fix this with out it costing me a arm & a Leg.. Thank you

Asked by for the 1995 Buick Riviera
It is probably the mode door actuator. We can fix it for you..