Blower for ac/heater only works on highest speed??? Can you help? on 2000 Jeep Wrangler

Blower for ac/heater only works on highest speed

2 answers
Blower resistor is defective! NAPA part # BR257 Once you see this new part it's a no brainer how to find and replace the old one! 2 scerws and a wire connector. Hint, it will be mounted very close to the blower motor!
under the glove box on heater case.also ck for burn't wiring at resistor