Resistor and wiring are in the underside of the HVAC housing, just in the upper part of the passenger footwell. Just look up from in footwell. The blower motor sits (or in fact hangs) there as well. If you have manual system, you have a resistor, but if you have the automatic zone control, there is a controller at the same spot.
JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.