Need help with some 3B and ABY/ADU differences

[UrS4boy]

Somebody on my home forum, quattroworld.com (UrS forum), wanted a primer on the progression of the RR, 3B, AAN, ABY and ADU. I have gotten some conflicting comments, e.g. the ABY has a serpentine belt accessory drive system (or does it?). Remember I am in Canada where we got ZERO S2s so no ABYs.

Here is the post:

http://forums.quattroworld.com/s4s6/msgs/194160.phtml

Here is an Autoshow ABY cut-away showing a V-belt driving the PS/PB pump.

[andy10v]

3B, ABY and ADU are V belt for power steering/brake pump, alternator and air con, only the AAN was serperntine.

[UrS4boy]

3B, ABY and ADU are V belt for power steering/brake pump, alternator and air con, only the AAN was serperntine.

Thank you Andy. That is what I thought but someone told me that the ABY used a serpentine belt system.

[cooperquattro]

Aby has 2 belts!1 is v belt that goes to the pas,the other is a small serpentine that powers the alternator

[shaun5]

Dont forget the air-con belt if you have got it

[UrS4boy]

Dont forget the air-con belt if you have got it

I presume that the A/C belt is another v-belt?

[newsh]

Yes