Hello I will help you with your question,
The blower resistor mounted next to the blower motor in the bottom of the blower case under the right side of the dash has likely failed. I can help you test to be sure if you have a 12 volt testlight or voltmeter but I am fairly sure replacing the blower resistor will solve your problem. Follow the wiring from the blower motor to the resistor
Let me know how I can help you with this
Sorry when you relist your question I am not notified that you still require help. Just use the reply button at the bottom of the post.
The resistor is about $40 and takes ten minutes to install.
You may be charged a diagnostic fee so the total is about $120 to repair this
Let me know how I can help you