interior blower fan control not working

blower motors tend to have problems/poor connections which draw a high amount of amps & burn out components. I would recommend checking power & ground to the blower. More than likely you'll find an open in the ground circuit. If so, you can jumper the ground for testing purposes & check the amperage draw. Also, look for burned spots at the blower & resistor connectors. If you have high amperage draw or burned spots, I would recommend replacing the blower motor AND resistor AND splice in new pigtails for both.