how or where do i find the heater resistor on my 1994 dodge 2500 four wheel on 1994 Dodge Ram 2500

i am not sure how or where to look

Asked by for the 1994 Dodge Ram 2500
Look on the firewall right side. If the blower isn't working it also has a fuse and relay. But if not working on all speeds it prob. is the resistor.