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What does the Final Stage Unit or Final Stage Resistor Do? Is there only one function?

I found conflicting evidences here regarding the true function of the FSR. One thread states that it is only linked to the Blower and regulates the blower speed. Surely it has to have more function than that. For those who have good knowledge on this pls shed light. I also noticed that people who have defective FSR have different symptoms, how is that? Im a newbie to this forum. Thanks in Advance.
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