thanks for the replys guys, no there are no vents in the roof lining,and i pointed that out to the guy today as i read that in the manual,he said that not all the f/b aircon models have those vents ??? he said that as the front control panel has front and back independent control that it means its a duel system ?? sounds a bit wrong to me to be honest,especially as my original mechanic who might i add has done my cars for about 6 years now and have found him to be incredibly honest,reckoned it was a single system not a duel,my original mechanic therefore put 700+50gms in but the guy today put 1100gms in,but neither worked anyway lol,this is all very confusing for me i gotta say,so just before closing time i popped down to my local ford,hoping to just approach a mechanic for a bit of advice,needless to say none of them would talk to me and pointed me towards service reception. well they were sorta helpfull but not really,wouldnt confirm wether it was a duel or a single system,but promptly told me that the early models suffered wih aircon problems,he also said it would be strange for the pipes in the back to develop a leak as they was alays dogged with leaks in the front end,he also said the pumps had a history of breaking down internally and agreed that if swarf was found in the coolant that its likely to be the pump,but could also be the main climate control panel,jesus christ something else to think about!! in the end he said they would be happy to take it in and gas it for