Changed alternator today on 2.2 Brera. Was very straight forward.
You remove the inlet manifold (plenum chamber). First remove negative connection on battery, then pinged apart with a small screwdriver the 4 retaining clips around the rubber inlet manifold to head joint. These can be re-used and clipped back together with flat pliers. I then removed all electrical plugs from left and right side of manifold including MAF. A 10 mm socket and combination spanner removed all the nuts and bolts including the one underneath. (Put your hand through underneath from battery side)
Undo clip around air filter connection, then plastic cooling pipe from head and rubber hose that goes to bottom of radiator. Remove that pipe. Remove the two air pipes on the battery end of manifold. Finally remove the large centre bolt in the inlet manifold that's now holding everything in position. Pull the manifold away from cylinder head checking for anything that's still connected or caught.
Now remove the two electrical cables on the alternator and 45 degree metal bracket attached to the block, then the power steering pump and alternator fixings. The main ones are male splined (torques) and female hex heads in front of steering pump. You can ping the belts off as everything becomes lose. Pull the alternator out
Now reassemble everything in reverse order except the belts. These will have to be put on last. I found it easier to push in and tighten by hand the top alternator bolts and then jiggle and put the bottom ones in tight. You can then remove the top ones and put the pump assembly into position knowing all the holes line up when you put the bolts back in.
Once you have reassembled everything. You need to jack up the car and remove the wheel and plastic plate in the wheel arch to gain access to the front pulley and tensioner.
With the help of another person, put the alternator belt on the alternator pulley then under the tensioner and as far round the bottom pulley as possible. Now the tricky bit. There are three slots in the casting of the tensioner arm. Put a large flat screwdriver into one of the slots and push up as hard as you can. The arm will move up allowing enough slack on the belt for your second pair of hands to push it onto the bottom pulley.
Next put power steering belt around bottom pulley and as far as you can over the top pulley. In the centre of the top pulley is a female hex head. In the direction of tightening, rotate the pulley moving the belt on as it goes round.
Now check everything, top up with antifreeze mix (or water) loosen bleed screw in top of plastic pipe then start engine. Run until plastic pipe is hot and air bubbles stop coming out.
Now have a beer.