3. We particularly liked this feature on the radiator body. Flaps like these help prevent the electric fans from burning out. When a vehicle is going so fast that air is moving into the grille (and through the radiator) faster than the electric motors that push the fans, the fans themselves will spin faster than the motors, and this can cause the motors to burn out. These flaps prevent that. They simply open up at high speeds, allowing air to move through them, and taking the strain off the fan motors.