Hey Mechanics. Thermostat in a radiator hose

The problem with mounting a stat "higher in the system" is "IF" the coolant level gets a bit low..........Don't know the vehicle or hose routing, but if it can generate an air bubble in the stat vicinity, it could overheat before the stat can absorb enough heat to open.

This is also a problem with a higher mounted sensor for the gauge.......I've seen them a time or two mounted in a top tank bung. If the coolant gets a bit low, the gauge will read low, and you will be "behind the curve" so to speak on engine temp