In most cases, a failing blower motor resister will only work on high speed and no other. Is that what is happening? The idea that it turns on and off when you hit bumps sounds like there is a loose connection as well.
I need you to do me a favor. Take a look at the pic below and let me know which one fits your vehicle. I can't believe how many different options were possible on this vehicle. LOL Before I start digging into schematics, I want to make sure I have the correct ones.
Let me know.
See pic below.
Sunday, November 6th, 2022 AT 7:55 PM