hey,

i have a 1989 Maxima Se. When i try to turn on my air condioner, by clicking auto or even the fan button, nothign happens. No air blows! not even my heater. sometimes when i hit the dashboard hard it comes on. whenever i click the fan button, i can hear the clicking sound to my right on the dashboard. is that the fan? do i have an electrical problem? plz help me guys!

 

I just recently had my AC recharged after I changed the heater core, and everything charged all right, but the relay inside the control unit wasn't wired in properly, so it wasn't working... My vents won't shut off either, and I'm thinking it's the control unit as well.
You may want to take it apart and check for loose/bad connections inside it.
I would on mine, if I didn't have the damn cable superglued in place...