Recently my heater blower stopped working most of the time. It will occasionally turn on after driving for a while. When the heater is set to off and I push a setting I hear a thump coming from the passenger side floor, but no blowing. When I changed fan speeds I hear a clicking coming from the glove box. The truck is producing heat but not blowing from the vents. So far I have only changed the resistor, it looked like mice were using it as a toilet. Before I tear apart my dash I would appreciate a little guidance. This is my first time dealing with this type of issue. Thanks.