I did them on my 2000 328i I would remove the fan. There is not a lot of room up there and the fan still being there will make you very unhappy. Don't ask how I got the fan off I worked on it and I was about to give up and I turned around and my Dads had got it off. I think it's a age and leason thing Dad are good for them. I would see if can rent a wrench from Autozone or such to take it off.