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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2001 E320
1991 350SD 265,000 - SOLD
2000 VW Beetle 1.8Turbo - restored
1997 E320 - SOLD
1988 190E - SOLD
1969 Mustang - SOLD