Click on the following Link. It has the Serpentine Belt Diagrams you will need. Regarding "How". The Tensioner Pulley ARM is "loaded" with a spring. The standard rule: Rotate/Move the Tensioner away from the belt contact area and towards the open area/non belt contact area. In Diagrams the Tensioner is Identified as #7 and in the next as #6. These should be rotated counterclockwise and down and to the left away from the belt. While doing this, the belt will loosen and should removed from one of the more easily "other" Pulleys. This Link also has many other useful Diagrams for your use. http://www.2carpros.com/car_repair_information/year/2002/make/volkswagen/model/passat/2002_volkswagen_passat_drive_belt_routing_diagram.htm
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Click on the following Link. It has the Serpentine Belt Diagrams you will need.
Regarding "How". The Tensioner Pulley ARM is "loaded" with a spring. The standard rule: Rotate/Move the Tensioner away from the belt contact area and towards the open area/non belt contact area. In Diagrams the Tensioner is Identified as #7 and in the next as #6. These should be rotated counterclockwise and down and to the left away from the belt. While doing this, the belt will loosen and should removed from one of the more easily "other" Pulleys.
This Link also has many other useful Diagrams for your use.
http://www.2carpros.com/car_repair_information/year/2002/make/volkswagen/model/passat/2002_volkswagen_passat_drive_belt_routing_diagram.htm