2001 Volkswagen Jetta diagram installation belt

Here is a link to a picture of your Jetta's belt routing. It is from on this site. Over to the left side of the page there is drive belt routing link.
Click on the link and scroll down that page..

https://www.2carpros.com/car_repair_information/tec_info/2001/volkswagen/jetta/2001_volkswagen_jetta_drive_belt_routing_diagram.htm

You also should have a sticker somewhere under the hood with this picture.
Glad to help.