Re: Blowing Resistor packs
The only way to "test" would be to measure the current draw... Many cheap ammeters cannot even test the fan as it can easily draw 15-25 amps which is above what most DVOM's will be able to handle, furthermore, to measure current without an amp clamp you have to put the meter in series, aka you must basically cut a wire and put one lead on each end of the broken wire to complete the circuit... not suggested at all. If your burning up resistors, I completely agree with Tom, replace the blower motor.
2005 Jeep Grand Cherokee - Gone but not forgotten!