Hello,
This could be due to a loose connection or a internal malfunction that causes the fan to come on if you hit a bump.
The blower motor is located under the passenger side dash.
In order to remove the motor, you will first have to remove the evaporator case. This will allow access to the mounting bolts for the blower unit.
https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only
I have attached complete replacement procedure below.
Please let me know of any questions.
Thank you.
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Thursday, October 28th, 2021 AT 8:02 PM