Blower motor runs all the time

Hello,

It sounds like might be a issue with wiring. Could be the switch that controls it, somehow it has faulted and stuck on the "on"position. Are you able to change the speed of the motor?
If you can change the speed then it is not the resistor.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

I have attached the wiring diagram for the blower system of your car.

https://youtu.be/Hlna_kUt7As

Let me know of any questions.

Thank you.