Serpentine belt diagram

Question edited for clarity.
Question moved to model category

https://www.google.com/search?q=2001+A8+Quattro+4.2.+serpentine+belt+diagram

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Jeff, Check the attached links,instruction and guides, diagram for a serpentine belt, Good luck
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Below is the master help link provided to go through belt routing diagram:---Timing belt, drive belt, serpentine belt, accessory belt, fan belt, engine belt routing diagrams for all types of car models?
Click the link below: ----

http://carbeltrouting.blogspot.in/2012/02/timing-beltdrive-beltserpentine.html
----------This will help. Thanks.

If you have a 4 cylinder check out this sight for a diagram of serpentine belt http://www.thesaabsite.com/93/93pulleys.htm#BELT+%26+PULLEY+SETUP+%28NOT+SPORT+SEDAN%29

Use a 6 or 8 inch 1/2 socket extension bar and place it in the top of the tensioner pulley, there is a notch in pulley for this. The tensioner pulley is near the firewall at the top of the engine....make a diagram of the belt routing and note which side( smooth or grooved) is lying on the pulley(usually grooved side of belt). Next you would pull tensioner pulley forward and slip the old belt off....you would route your new belt the same way and slip it on the tensioner pulley last.....you will need to pull the tensioner pulley forward again to get the slack you need to slide the belt over the pulley. I have found the Saab to be one of the easiest cars to change the serpentine belt on. I hope this helps.

Im assuming you already know about using a 1/2 inch drive extension to position the tension pully so you can get the belt on or off.

You didn't list your motor size so please pick the applicable diagram:


Accessory serpentine belt routing—4.8L, 5.3L & 6.0L engines


Accessory serpentine belt routing—5.7L engines with A/C


Accessory serpentine belt routing—5.7L engines without A/C


Accessory serpentine belt routing—6.5L Diesel engines


Accessory serpentine belt routing—7.4L engines


Accessory serpentine belt routing—8.1L engines

2.0L Engines
See Figures 11, 12 and 13
The accessory drive belt for 2.0L engines has no provision for manual belt adjustment, since these engines use an automatic belt tensioner. Drive belt slack is taken up by the automatic tensioner.
Movement of the automatic tensioner assembly during engine operation is not a sign of a malfunctioning tensioner. This movement is the tensioner self-adjusting and is required to maintain constant belt tension.
The belt tensioner has a belt length indicator. If the indicator marks are not between the MIN and MAX marks, the belt must be replaced.
Fig. 11: Drive belt routing-2.0L SOHC engine with A/C Fig. 12: Drive belt routing-2.0L SOHC engine without A/C Fig. 13: Drive belt routing-2.0L DOHC engine