Quote:
Originally Posted by Rob175
Hummm....not sure about the accuracy of that reply. Typically the sensor is NOT in the tank....rather it sits in a channel molded into the bottom of the tank. If it needs to be replaced it can be pulled without ever draining the tank. The sensor does not use a "float" inside the tank, it's purely an electro magnetic wired sensor. It DOES NOT SIT IN THE TANK 
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It’s dead on accurate.
How do you suppose that sensor knows the coolant level? It can’t see it

The float tells the sensor the coolant level via a magnet in the float that the sensor “senses”.