How repalce audi a6 drive belt - 2000 Audi A6

Question edited for clarity and toss in some CAPS.
Question moved to model category.

In the link, also check the images tab.

https://www.google.com/search?q=2007+audi+a6+2.0tdi+bre+engine+serpentine+belt+diagram

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Your describing a broken drive belt tensioner, you can probable see it in the engine compartment as the engine is running

Normally they fix these, during Timing belt Replacement. For an Audi A6 3.0, the replacement interval guide is every 80000miles or 8 years. Repair time, remove and install is 5hours.
The cost of replacing a belt as part of a routine service could be as little as 5 to 10% of the repair cost following a belt failure.
So if you decide to keep your car, keep in mind to spend at least $1000 for maintenance. Mine was a 2000 Audi A6 T2.7. With two, turbochargers under both sides of the engine. I sold it with 80000miles, without changing the belt. Hope this may help.

2.4 not such a thing. You mean 4.2 right?? You must chnage timing belt water pump and all related probably bout 1600.00 . Much cheaper that an engine rebulid work. If belts breaks vakves will bent

Audi A6 2,5 TDI 5 cil is a great car. The engine is one of Audi's most tested engines. But models before '96 will rust quite a bit, if you dont look af it. So look for rust and be sure that the drive-belt is replaced in time.

for the most part there is a diagram under the hood but give this website a try Drive belt Diagram www.webcrawler.com wish you the best of luck Michigan Man.

Audi revised the specified cam belt change interval from 120k to 80k, after a class action lawsuit was brought against them.
However, they have been known to break at around 65-70k. I always replace them earlier as a precaution..

Sound's like a bad alternator, you can check the alternator by measuring the voltage on the battery when the car is started, it should measure above 12.6 volt's but not higher than 14.5 volt's, check the drive belt tension, a lose or wore drive-belt could cause problem's with the alternator charging the batery, check the battery terminal's for corrosion, along with the connection's of the battery cable's.
Hope this help's, good luck.

I found this one for timing belts manuals.

In response to BiTurboA6 comment, there is a full write-up at http://www.scribd.com/doc/12127197/2001-Audi-A6-Alternator-Replacement-Instructions