This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
The voltage rating is fine, the amperage level should be fine as well. You can connect the fan to the two-pin connector near the back left side of the motherboard. The pinout for the "Fan connector" is +12V and Ground. The +12 is the pin closest to the powersupply, or the pin on the left if you are facing the GS motherboard from the front end. Most fan wires are color coded, so the red wire goes to power and black to ground. By: Mitchell Spector