wiring a Aerocool Shark computer fan for Refrig. Cooling

Adding a rheostat will only make the fan run slower. The yellow wire is a tach signal that a computer uses to sense fan speed so it is not needed for your application.

rtate wrote:
If I simply tie the red and yellow from the fan together then run power to them, would that make the fan run at high speed or would it run at low speed?

Just answered my own question. Red and yellow from the fan tied together still give me low speed only. I will have to pick up a rheostat and try that.

If I simply tie the red and yellow from the fan together then run power to them, would that make the fan run at high speed or would it run at low speed?

MrWizard wrote:
i believe Yellow is the temp sense control voltage

put a variable potentiometer AKA 'POT'/rheostat between the yellow and red wires

and then adjust it to change the speed

moved from technology corner

Ok. So how would I run power to it? Would I hook up the power to the red wire from the fan with a lead from rheostat to power from my frig? The other lead from the rheostat would go to the yellow wire from the fan?

Sorry for being so ignorant, but this is kinda greek to me.

i believe Yellow is the temp sense control voltage

put a variable potentiometer AKA 'POT'/rheostat between the yellow and red wires

and then adjust it to change the speed

moved from technology corner

Ok. I just tried hooking it up as suggested. Yellow to my 12v positive supply amd black to ground. Nothing happens. Seems like the only way it will run is with the red from the fan to red or positive from the frig and black to ground. Then seems to only run at low speed. Is it possible the yellow wire on the fan is supossed to provide some kind of feed back to a speed control built into the fan?

On a computer power wire, yellow is 12v and red is 5v. That is how this fan is used for "low" or "High". It should have come with a cable that will connect it either way to a power supply.

stela wrote:
I'm thinking you could wire in a switch that will manage both depending on your needs and the weather.

Thats an idea. I will hookup the yellow to positive and see what happens. I hope that is high speed.

Any other ideas.

I'm thinking you could wire in a switch that will manage both depending on your needs and the weather.

I would say try and hook up the yellow wire to the positive instead of the red wire. red and black might equal LO, yellow and black might equal HI, not sure but just an educated guess