There are Venetian blind type slats that can be seen with the bonnet up between front grill and fan/radiator.on my 6/17 RRSport SDV6 HSE Dynamic.( they weren't on my 2010 RRS). I'm guessing their able to open/close automatically relative to engine operating temperature. Could someone just explain whether or not this is the case. They appear to be remaining closed currently even with temp gauge indicating normal temp but presumably should open once summer and global warming arrive !