1998 Chevy Tahoe Not Blowing

When I try turnng my AC on, only a faint little breeze comes out of the vents. Before it got to this point, it used to stop working and I found that by giving the black ac housing under the passager side dash a kick the ac started cranking again. Well, those quick fixes are no longer working. Logic tells me the motor has just gone bad. I guess my question is, which part should I start replacing first to get it back to working like it once did? new motor, new resistor..something else? I really appreciate any help, especially your time!
Thanks,
Brian