Check out the link below. It's a description for replacing the entire cooling system, but it describes changing the belts as well. Good luck.
http://bimmerboard.com/forums/posts/199986/
diagram of serpentine belt for 528i BMW
Remove fan clutch with fan impeller. Remove A/C compressor drive belt. Remove cap from tensioning roller. Relieve tension on drive belt. Remove drive belt. Reverse procedure for installation.
you can put a wrench or a socket on the tension pulley, releasing the pressure on the belt.
between 80 and 100.000 km drive safe
There should be a diagram somewhere under the hood or in your owner's manual that will show you the correct way to replace it.
how to change the drive belt
what model and which belt? If it is a 1000 series you have a transmission drive belt and a deck belt. I you have a 2000 series or higher or a cub cadet with an IH logo then you only have one belt the deck belt and no drive belt you have a drive shaft. So the model of the tractor and what belt needs to be given before the correct answer can be given.Phil
How do you change a fan belt for a 2000 Toyota Avalon
how to install a drive belt on a 2000 jeep wrangler 2.5 liter
When It no longer hold proper tension if the belt is squeaking then it is probably time to change it
How Do I change A drive belt on a John Deere LT190?
The 2000 Mazda Protege has electric fans, hence there is no fan belt to change.