Brian Eslick from How to Automotive http://www.howtoautomotive.com/ walks you step-by-step through the process of replacing the serpentine belt and tensioner.
How to Replace all the Belts and Pulley on a BMW 3 Series E46
Brian Eslick from How to Automotive http://www.howtoautomotive.com/ takes you step-by-step through the process of replacing the drive belts, idler and tensioner pulleys for the alternator and AC on a BMW 3 series E46.
How to Replace the Drive Belts on a 2001 BMW X5 with a 4.4 L Engine
Brian Eslick from How to Automotive takes you step-by-step through the process of Replacing the Drive Belts on a 2001 BMW X5 with 4.4 L engine.