with the way that radiator is i'd say that a certain percentage of your cooling surface area has been lost which may account towards the car getting fairly warm
but as for the fans kicking in after 1/2 way to me sounds about right if comparing it to say the 604 we have here
it won't kick in the thermo fan till the temp is a fair way up (still away from red) but over 1/2 way
on the road though the temp will sit 1/2 way and sometimes back a little and going down hill it will actually come back a little more and then normal driving it will return to just before 1/2 or on 1/2 depending on the air temp
going up hill though it will go up a bit but then back to normal again after the hill climb
apart from a slightly modified radiator i had once in another 604 this has to be about the best i have ever seen a 604 work in the cooling department (oh and the one my mother had was pretty damn good as well but it was a new car)
see how the car goes once you are on the road but i'd keep a close eye and that radiator as i wouldn't like to be the one driving too far with one in that condition
but as for the fans kicking in after 1/2 way to me sounds about right if comparing it to say the 604 we have here
it won't kick in the thermo fan till the temp is a fair way up (still away from red) but over 1/2 way
on the road though the temp will sit 1/2 way and sometimes back a little and going down hill it will actually come back a little more and then normal driving it will return to just before 1/2 or on 1/2 depending on the air temp
going up hill though it will go up a bit but then back to normal again after the hill climb
apart from a slightly modified radiator i had once in another 604 this has to be about the best i have ever seen a 604 work in the cooling department (oh and the one my mother had was pretty damn good as well but it was a new car)
see how the car goes once you are on the road but i'd keep a close eye and that radiator as i wouldn't like to be the one driving too far with one in that condition