Bearings could be going bad in the blower, it could need replaced. There is also a resistor pack in the air box under the glove box that could also be going bad, usually if the resistor block is going bad, you will lose the slower speeds of the blower but still have full speed.
Thanks for this answer. I have heard about this resister block and I will find out.
My front blower does not work proper. It varies.
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