Engine Temperature problem with my New Camry

My old '95 doesnt do that,..but when you think of it, it's a bit futile. When the engine is turned off, all the circulation of hot coolant stops. This will cause a rise in engine-block and head coolant temp,..the radiator cooling fan sensor is in the bottom tank of the radiator. This means while it may come on when the car is next started, it equally may not depending on ambient temp,..whether the engine was working hard etc Cooling the radiator when the car is stopped, only cools approx 1/3 of total coolant which resides in the radiator. The hot engine coolant is still waiting to be cooled by recommenced circulation.

Jason

Yup, which is why most vehicles do not run the electric cooling fan when the ignition is off.