Just yesterday I hop in the car and drive off and noticed that the Climate Control Fan was fairly loud, I turn the knob to the off position and it doesn't turn off. The Fan is staying on at about half power. I can turn the fan up to full and it goes to full, but when I go to turn it down it wont go below about half power even though I have turned the knob.

I think the actual knob is working because when I turn the fan speed knob to off the A/C light goes off, but the fan keeps going.

It would be great if anyone has any ideas as to why this has just started out of the blue.