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eobard said:I use diodes to lower the voltage on my fans. A 1N4001 diode will shave .7v off and a 1N4002 (which I use because I can't get the 4001's locally) will shave .3v off of your fan's 12v. I run 5 in series and lower the voltage of my heater core's fan to 10.5v and it's a lot quieter. You can see in the pic below what I've done.