Plenty of good suggestions. Thanks guys.

The reason I wanted to try to change the fan was that I thought maybe one of the wires is defective and, as STT mentionned, "theres power and there is one wire for measuring rpm of the fan.    If it cant read that, it'll max the volts to max the rpm (as failsafe)." So I was thinking changing the fan for a similar one was worth a shot.

The other idea I had was to basically go for a weaker fan. The one that came with the antminer is 12V, 1 amp. And it's pretty noisy at max power. I tried one of my PC case's fan and this one is 12V and 0.16amp. It is dead silent, but it is also so weak that I wouldn't want to risk using it on the antminer and having it overheat and possibly bricking the unit for good. So I was thinking about a fan that was maybe 0.3 or 0.4 amp. Do those even exist? Running at full power it probably wouldn't be too noisy and it would get the job done until the day I retire my antminer for good.

Trying to plug the fan on the other fan connector is a GREAT idea. The problem is that the wire is too short. But it's still worth a shot. I'll unscrew the fan tomorrow and place it on the other side to try it. If the fan runs normally then my problem will be solved. I'll just connect the fan on the other side of the unit for good. If the fan still runs at maximum then the problem is clearly the fan so I'll just get a new one. I could also try s1lverbox 's solution. My time during the day is limited but I will try to make time for this tomorrow.

Thanks again for all the help.