This is the timing belt, I think. Takes a lot of expertise. Get the shop manual. If you screw it up, you can damage the engine.
How long will it take to replace a belt tensioner unit and serpentine belt in a lexus 1996 sc300?
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Loose or worn A/C drive belt. Tighten or replace. If serpentine belt, replace.
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Replace it.
diagram for serpentine belt on 1996 Pontiac Bonneville se
Have a look at this site for a detailed guide to changing the timing belt and other servicing matters. http://www.taligentx.com/passat/
If it's on a 1.8 T I'll include an instructional video below in the "Related Links" section. Hope this helps you out.