1997 Other Chevrolet Models Blower motor/ Fan speed

I have a '97 chevy S10 Jimmy with a blower motor problem. The blower motor started cutting out from time to time and now won't run at all. I disconnected the plug from the blower motor and applied 12 volts to it and it ran fine. Checked the switch and it has power to it when the a/c is on. The compressor is kicking on as well when the switch is turned on. My next thing was to check the fan speed relays but can't find them. Also I read that there's a fan speed resistor somewhere but can't find it either. Any help would be appreciated!!

Thanks