I recall in previous years the fans coming on during start up. This is an M104 motor, is this not correct?

If i let the car idle currently in the florida heat, the temp will rise, and i have coolant bubling over in the tank. The high speed fans are not coming on at all, unless I unplug the sensor at the thermostat housing. After this occurred yesterday, as a test, i noticed the upper radiator hose had sucked in. To get air back in, I loosened the cap on the coolant tank.

Where is the coolant temperature sensor?

Thanks

Fq

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W124
Sportline Swaybars
Bilstein HD Struts
16" E420 wheels