Fellow Audi Philes, I have (2) questions for the almighty quattro list. 1). 1990-90 Would low freon pressure not allow the ac compressor to engage. Not even for a short time?? 2). How does the Bentley Manual compare to the All-Data CD-ROM as a reference?? I am needing to purchase reference source. TIA, Pat Roberson email home: pat@p-b.mdn.com office pat@mpisys.com '90-90 '86-5KCST '72-911S