Am in the middle of doing mine as well. Cannot see how it comes out the top - I have removed the undertray, 2 screws at each end of underside of front bumper. 2 big bolts in front of headlamps out and then slid bumper forward for better access. Removed all pipes as I am also changing thermostat. Remove slam panel [above rad] Disconnect air con rad [4 screws] from rad, Fan shroud [2 bolts top of rad] eased it up from [rusty] clips at bottom. Removed under rad crossmember 4 bolts. Then rad dropped out from below. Suport the air con rad and fan unit with string & a piece of wood! I found all the bolts, screws and fixings were rusty even though the car is almost rust free. Alfa must have bought a cheap job lot. Will be replacing with stainless where possible.