Hi, as Richard has said, if the direction of air knob is directing to the Screen then A/C comes on automatically, its because it has less moisture and aids to clear the screen quicker.
The 1.6 TDCI has a Cambelt, not too sure on interval, will have a look on E-Tis later.
Has the Plank who scraped your car managed to dent the panels, or is it just marked? Tar and glue remover works a treat in getting the Black bumper scrapes out, along with a little cutting compound ( T-Cut ), then a bit of polish.
2010 Titanium 2.0 TDCI Panther Black.