Hello,
This could be due to a faulty blower motor resistor. Many times when these resistors go bad it will only allow one speed of fan.
The resistor is located under the passenger side dash.
https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only
I have attached diagrams below for your reference, also included the test procedure for the resistor.
Let me know of any questions.
Thank you.
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Friday, July 1st, 2022 AT 3:58 PM