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Lots of cars already have a low coolant warning sensor, in many cases it is a float in the overflow bottle.
Also used to indicate low brake fluid levels in the master cylinder reservoir.
I actually thought this was a great idea but after reading the responses here you would think I am either an idiot or a thief.
Maybe it's the other way around. Maybe some here are regularly adding coolant to their systems like their car was powered by a steam engine, instead of fixing the problem.
In 40,000 miles I have never added coolant to my wifes car or to my car, or even to my17 year old truck.
Any sensor configuration would also be capable of informing the operator of any initial low coolant situation DUH! That's not even a legitimate concern unless you operate a vehicle that is constantly loosing coolant. I can smell blown head gaskets following cars down the road.
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