It sounds like you have a short to power. Did the fan continue to blow when the fuse was out? If it didn't, I have a feeling the short is at the blower motor control processor. The power from the fuse is right next to the wire which sends power to the blower motor.
I attached the entire wiring schematic below for the system. I highlighted the wire from the fuse to the processor and then to the blower motor. The wire from the fuse will be red and the one to the blower motor is purple. I need you to disconnect the connector and check to see if the pins melted into each other. Also, check the wiring to the connector for a place they may have shorted.
Here is a link you may find helpful when checking:
Note: There are two pages of schematics. I had to cut each in half to make them readable for you. I did overlap them. Your focus should be on the first two pics.
Also, if there is no short, there is a good chance the processor is bad. I attached the directions for replacing it in the event you determine it's bad.
I hope this helps. Let me know what you find or if you have other questions.
See pics below.
Also, I added the last pic to help you locate the component.
Images (Click to enlarge)
Wednesday, July 28th, 2021 AT 10:08 PM