I need help finding the location of the Heater Blower Motor Resistor?

I need help finding the location of the Heater Blower Motor Resistor on a 2000 Pontiac Grand-AM GT. The heater fan only works on the highest setting. I pulled out the glove box, heater control panel, & radio and tried following the wire harness back from the control panel. However the harness splits off with one section going under the rug by the center consol, & the other disappearing back by the firewall. Since I had everything out, I looked under the dash on the passenger side, but I didn't see anywhere where the resistor would fit/go into. I had the same luck under the hood. Maybe I just didn't see where it belonged. I ran out of time so I didn't get a chance to look under the dash on the driverside. The resistor I got from my auto-parts store is made by Standard (part# RU43). The resistor is a Printed Circut Board Card that is mated to a 5 pin male plug with two attaching ears (for screws/bolts). It's obvious the resistor slides into a port of some sort. I noticed that the resistor has an attached foam gasket which is leading me to think it most likely belongs under the hood somewhere.

Thanks in advance for any info you can give me in replacing the resistor, and I hope you folks have a great holiday season. I did send in a donation for the help & again thanks.
Dave