The front of the engine has a grille through which air passes in older engines with conventional radiator systems. This requires either forward movement or aid from the radiator fan. The temperature of the coolant inside the radiator is lowered as air flows through it. This design has a big downside despite being successful. In particular, the radiator ends up using more air than is required for effective cooling. There is no immediate danger from having too much air in the engine compartment, but traditional engines have significant drag due to their design. Of course, the lack of aerodynamics results in a significant reduction in fuel efficiency. Radiator shutter assemblies are a common feature of modern engines. These systems include motorized shutters that may be closed totally or partially to limit the amount of air entering the engine. The shutters open to let more air in as the engine’s temperature starts to climb. A car that is more aerodynamic and gets greater gas efficiency as a consequence. The radiator shutter assembly, however, might deteriorate or fail with time, just like any mechanical system. For your engine to run at the proper temperature, the component on your car has to be replaced if it has seen better days.