Wife just cleaned the Frontier inside and outside and looks really good. Got in to drive to the store, turned on the A/C and then the fan and started hearing a weezing noise coming from the fan/blower. Wheather I have the speed on 1,2, 3, or 4 it does it. A/C worjks fine but the fan is making the noise. What could be the problem. 2002 Nissan Frontier. Any help would be appreciated.