So that's why my Focus Titanium's heater warms up so fast. I thought it was due to a small capacity radiator system, but looks like the shutters are doing the deed.
2014 Mustang GT custom ordered to replace the GT500: Sterling Gray, NAV, Recaros, Brembos, Glass Roof, back up camera, 6 speed auto, loaded
2012 Focus Titanium - 18" wheels with handling package
2009 GT500 Shelby (700 rwhp) - sold