Hello,
It sounds like you have a faulty blower motor or the resistor for the motor.
Both of those items are located behind the glove box on the passenger side. You will have to remove the glove box in order to access those components.
https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only
Check to see if you are getting power to the connector for the motor.
If there is no power, then you have a short in the wiring harness. If there is power, then the component is faulty.
I have attached diagrams for your reference.
Please let me know of any questions.
Thank you.
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Friday, October 1st, 2021 AT 10:46 PM