01 Tahoe Fan issues

My fan will only work on 3,4, and 5. It makes a bad squealing noise when i have the air on, but in the winter with the heat it doesn't seem to do it.

It needs a new blower motor resistor module, mounted right near the fan- follow the purple and black wires from fan back to the bad module. Easy to remove and replace- Autozone (and any others) have the new one.

Thank you, I will give that a try!