OK, thanks Gary.
I won't connect anything up yet.
I am putting a peltier cooler on the outside of the camera body to cool down the whole body so I don't cause cold shock to the chip.
The fan just blows the cold air inside the case towards the front where the chip is.
I have tested it with a 12 volt fan and it got rid of 99% of the noise.
But the 12 volt fan doesn't quite fit in there properly, that's why I am using the little micro fan.
My cooling test results are here (using the fan is in the 4th post):
http://www.cloudynights.com/ubbthrea.../o/all/fpart/1