i turn on the heat switch and under the dash makes a loud noise and shakes the whole dash passenger side . my control switch only works on high so im guessing its the resistor also , im still getting heat but its getting real loud ,,is it the blower motor going bad or something else ..if so do i get to it under the dash or thru the motor .thanx

 

It's the blower motor. You get to it from under the hood on the passenger side, there are 3 or 4 bolts holding it in.