A lot of the times the way you hook up the fans to the power supply can determine which powe setting they are on. 3 pin or 4 pin connectors? Do the y have switches on them? Some fans have auto, hi and low settings on them.
Some fans will only run at one speed no matter what, make sure you have adjustable fans. YOu can go to zipzoomfly.com or newegg.com and do a search for case fans and find some that suite what you need. YOu can replace fan real cheap nowadays.
Also check to see i you have eom software that came with your case that you may need for your mobo to be able to adjust your fans.
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You may not have the correct type of fan for this to work. Typically, you need a three or four pin fan (you will see three or four wires on the plug) for fan speed control to work correctly. If you only have two wires, your fans do not have speed control functionality.
You can also have another issue. If you do have a three or four ping fan, you may not have it connected to the correct fan headers on the motherboard for it to work correctly, or you may have it connected to an external fan controller.
You will need to check inside the button contacts to identify if the control of current is by a series resistor or by the coil winding.
Since the high speed is working it is possible that the series resistor coil is open.So check for loss of contact continuity in the switch, if not you can use the present model of electronic fan controllers to give you a variable fan control. This can be connected to the main hi speed connection.
Tip: Identify the wattage and buy the regulator according to the specs.(42 inch type)
some manufacturer already attached a variable speed controller when you purchased them, meaning the unit requires this control, but in your case when you purchased it, it does not have any, meaning they sell it to the market as ready to use, so why install additional control?
There might be an installation error during the assembly, so all you have to do is just interchange the wire connected to the control from LOW, MEDIUM and HIGH, it is a trial and error thing but it won't affect or damage your unit, maybe your high speed connection was connected to a low speed control, so just inter-change it. Remove the variable speed control
According to the schematics on your vehicle, it has a "Blower motor control processor" either built in to your controls, or in line between your controls and blower motor. Yo may get real lucky and find some dirty connections in that area, and get away with cleaning & re-connecting, but I wouldn't get my hopes up too high. You may end up replacing the processor, as it regulates fan/blower speed.
I can't see any reason why a Leviton fan speed control couldn't be used on any ceiling fan, after all, I don't even think Leviton makes ceiling fans. Second, you may be able to try using the 1.5 amp fan speed control and see if you can get by. The worst that could happen is the speed control wouldn't work or would only work for a short time and be junk.
Well, since you connected your fan directly to the power supply, you are not getting any feedback thru the graphics card interface. This doesn't mean there is a problem since your fan is running full speed all the time, it is actually better and you should be able to see a difference on the GPU temperature.
If the GPU temperature is still too high and the fan is running at full speed, did you apply a thin coat of thermal paste on the heatsink? if not, there is your problem.
Now just to be clear did you connect the fan to the power supply or to a spare motherboard connector. If you connected to your motherboard, you need to go in the BIOS and change some settings regarding the fan speed (let me know if this is the case and I'll help you further about that.)