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Originally Posted by ched454
I have two sensors on the water outlet connecting to the upper radiator hose. One sensor (single pole) is for the instrument cluster temp gauge. The second sensor (two pole - blue) is next to the first which I thought may control the aux fans. I also have a sensor (lt. green) in the head behind the IP. Which controls the aux fans?
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The two pole switch is the likely candidate for the fans. This switch closes one contact to start the fans at 105°C. and then it has a second function to shut the a/c compressor down when the temp hits 120°C. This would be about 1° before you crack the head on that engine.
