right i filled up the correct tank and there was almost nothing in the tank it must of took a litre of water to fill it up as she swallowed most of it and didnt spit it out i gave it a good hammering from 2nd to 5th on boost for a while with heaters on and they didnt go cold been giving it some stick all day doing 40 miles and the level hasnt dropped and it is pressurising very well but it has very brown water in the tank is that something to worry about? and now that ive topped it up with water could this sort my cold starting problem if the coolant sensor couldnt read anything? Thanks for there help everyone.