Fluctuating blower motor

[alia176]

Guys,

I'm pretty sure this topic has been covered but my search is not revealing anything. I think my search string is not adequate so if this issue has been covered in the past, please point me to it.

The blower motor in my '92 has been fluctuating. Rather than trying to explain the symptoms, I made a short video clip of it. The video will show you the fluctuating speed of the blower as well as the dimming of the lights. There is no discernible blower related squeaks or odd sounds coming from the blower area. Even if I select a fan speed manually, the symptoms still continue to occur. As you can see, the engine idle speed is very steady.

Let me know your thoughts!

Thanks.

Video link