Hi, Welcome.
Had our Sport for 9 years and it's always run on the halfway mark (just as our 2.2 does also). When we towed a caravan and were stuck in jams on the North Wales Expressway etc. it was essential that the electric fan worked, but it always 'waited' until the very last minute and used to worry me at times. These radiators do not have a bottom hose as you've noticed and I feel they need regular flushing out and lots of good quality coolant.
Tony.















