Lost lo and 2nd on fan
 

The AC/Heater fan in my 98 F150 stopped working on LO and 2nd. Will work intermediately. Runs fine on 3rd and Hi. Think it's the switch or the blower motor or resistor? Just started today.

Check the resistor first.

Thank you projectSH089. I was kinda thinking that way , but it good to get another opinion. It was corroded and one of the resistor wires had broke off. Never had a fan resistor go on me. Changed out today workin fine. Hardest part was working backwards with a mirror. Thanks again.