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Fast way to check to see if your radiator fans are working correctly is to:
a) bring the motor up to temp
b) turn on the AC full blast (lowest temp)
c) get out of the car and see if both fans are blowing hot air toward the ground ahead of each tire.
My left fan and/or ballast resistor was shorting out the system and blowing fuses about once every six months, so I bought a new resistor and now it's good.
Even when all is working properly, remember you have a real heat reading, not a glorified idiot gauge with a needle on it. There will be swings based on what you're doing with the motor.
Interestingly, my buddy's 07S has a temp needle that moves to a preset spot shortly after the motor has been run for x seconds and it stays there no matter what you do with the motor.
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