At highway speeds should the electric fan run constantly or not,I don't have a engine fan but do have a shroud.
If you have it set to turn on with the engine temp it should run at that engine temp. The fan doesn't know if the car is moving or not. When I tried running electric fans on mine they would run on the highway because the car got hot at highway speed. If your engine gets and stays at the switch temperature then the fan will run. If the engine is at 180 and the fan should run at 190 then the fan should shut off. I found when I tried mine the on/off switch wasn’t real accurate. Mine was to come on at 180 and the temp gauge was often at 190-200 before the fan ran and it didn’t shut off at exactly 180.At highway speeds should the electric fan run constantly or not,I don't have a engine fan but do have a shroud.