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Hi and welcome to Just Answer! I believe I have the diagram you requested.
1. Disconnect battery negative cable from battery and properly isolate to prevent accidental reconnection.
2. Remove the drive belt tension by lifting or rotating the drive belt tensioner off of the drive belt, using a 3/8-inch or 1/2-inch breaker bar.
3. Remove the drive belt.
4.Inspect all the components and pulleys driven by the drive belt.
Install the drive belt under the drive belt tensioner pulley by lifting or rotating the drive belt tensioner, using a 3/8-inch or 1/2-inch breaker bar.
Inspect the drive belt and the drive belt system.
Make sure that the drive belt is properly routed.
Inspect the drive belt length scale on the drive belt tensioner for the proper installed length.
Reconnect the negative battery cable and reinstall the rear seat cushion.
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2003 Jetta left rear window blue plastic part of the