Tracy Crook wrote:

Tracy, please expand on this: "Coolant level sensors are of almost no
use in this application."

Finn

Well, I did say 'almost'.  See later message on this subject.  But for instance, the low coolant level warning on my RX-7 is mainly useful only before the engine is started.  It will stop complaining after the engine starts and runs a bit (especially at high throttle when the coolant is well whipped up by the pump).  When it comes on again, a LOT of coolant is missing.

Ok. How much coolant let from that point to where the pump stops working (or is it already past that point when the light comes on again)?
Where is the sensor located (in the car).

Finn

 So, I think as an in-flight warning, it would not be very useful since when it comes on it will be too late.  But my main point is that there are far better ways to detect a cooling system problem early on.

Tracy