There is only a few motors on the road that the temp will stay at 160 degrees anyway, and once it gets above that you don't need a thermostat no way. I don't know what it is, but I would guess a car with 75,000 miles on it (rad.1/2 stopped up) with no thermostat with a Manuel fan will stabilize around 190 degrees. a car with an elec. fan on it proves that. most run a 195 thermostat and the fan keeps it at 210 to 225, and you take the thermostat out it would do the same thing. a car with an elec. fan about all the thermostat does is make it heat up quicker.