Need a fan for my amp?

[Austin42156]

I have had my Kenwood 450/4 amp for a while now and have been running it for about a year. It was fine at first but it started getting hot probably about 4 months after I had it. I looked around and realized the cooling fan wasn't turning. I doubt the amp is under warranty and I bought it secondhand anyways. I would rather fix the fan myself but I don't really know where to start? Is it possible that it could be something else besides the fan itself, is it very likely? I did a quick google search on the specs of the amp and tried to see if there was any kind of dimensions for the fan but I found nothing. I am fairly new to car audio and have never taken an amp apart. If anyone could help me or point me in the right direction it would be appreciated. I am afraid if I don't get the fan fixed soon I will have problems with the amp in the near future.

[firebirdude]

I'm no engineer, but should be an easy fix. Pop it open and see. Probably just two wires soldered onto the board.