This sounds like the blower motor is bad. To be sure let's use this guide to check the power and grounds. Here is a guide to help you step by step with instructions in the diagrams below to show you how on your car:
For the blower speed problem the resistor sounds like it needs to be replaced as well.
Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
Wednesday, May 26th, 2021 AT 10:20 AM