Will the engine get hot when the car stops for three hours in the weather of more than 20 degrees?

It will be very hot. Even in the weather of more than 20 degrees, after the vehicle is stationary for three hours, the engine still has some residual heat, but the engine usually does not overheat. The residual heat of the engine comes from the heat generated by combustion when the car is working, especially after long-term operation. After the flameout, the engine will still emit some residual heat, which will lead to the temperature increase in the engine compartment. Under normal circumstances, after three hours, the temperature of the engine will not reach too high a level.