I want a diagram of the route of the serpentine belt for a 2003 320I bmw

1997 BMW 540i Serpentine Belt Routing and Timing Belt Diagrams (2carpros.com)

You will find said diagram under hood near the front and around the radiator core support on a sticker and/or in the owner/repair manual.

timing chain?

Below is the master help link provided to go through belt routing diagram:---Timing belt, drive belt, serpentine belt, accessory belt, fan belt, engine belt routing diagrams for all types of car models?
Click the link below: ----

http://carbeltrouting.blogspot.in/2012/02/timing-beltdrive-beltserpentine.html
----------This will help. Thanks.

Need engine information, but it's easy to lookup on gates.com website. Use the part selector, run through the choices...make, model, year, engine size....and when you get the list of belts, click on the camera icon next to the serpentine or accessory belt listing. It will open a diagram of the belt routing.

You might want to go to the link below. You did not give year.

http://www.bimmerwerkz.com/forum/3-series-e36/1992-325i-serpentine-belt-problems-59093.html


Good Luck

You didn't list your motor size so please pick the applicable diagram:


Accessory serpentine belt routing—4.8L, 5.3L & 6.0L engines


Accessory serpentine belt routing—5.7L engines with A/C


Accessory serpentine belt routing—5.7L engines without A/C


Accessory serpentine belt routing—6.5L Diesel engines


Accessory serpentine belt routing—7.4L engines


Accessory serpentine belt routing—8.1L engines

I'm not sure but there is often a diagram on the underside of the hood.

Hey Andy a quick was to solve your problem is to locate a similar vehicle in a car yard, go have a look at the configuration and draw your self a quick diagram whilst your there.