A "radiator shutter" refers to a device in a car that controls the flow of air through the radiator. It can open or close to regulate temperature, allowing the engine to cool down or warm up more efficiently. Full definition
It also boasts active radiator shutters in the center and side air intakes which improves both aerodynamic and thermal efficiency. (car24news.com)
And yet all the goodies are hidden at the front end, with radiator shutters like in the AMG GT R, an Airpanel improving the aerodynamic efficiency, with slim MULTIBEAM LEDs and the Panamericana radiator grille. (mercedesblog.com)
On top of the new Jetta's reduced drag, models equipped with Volkswagen's 1.8 - liter turbo - four engine or the new 2.0 - liter turbo - four diesel engine receive an electrically controlled radiator shutter. (automobilemag.com)