hello,to everyone in audiland,my name is Robert,i love audis, and the peole who drive them i spent the last 3 days reading every archive thread by thread,its very interesting,and informative. i have some questions of my own i would like to have your input on.first off, i own a 92 CS100FWD w/ aah engine manufactured july of 92.I do have the famous engine chatter that gets quieter when at full op. temp. I will live w/ this for now the other problem,however,i would like to fix asap.my electronic cc will not adjust heat temps. from 63F thru HI setting is the same HOT!!!! this was ok thru winter but now spring is here{i hope}and i would like to keep it at 72F or so i did the odb and {2}error codes flash, 8.5 and 15.1i know this has to do w/ air flap but dont know where it is or what i can attempt to fix it HELP!!!your suggestions will be greatly appreciated i dont have bentleys,cant afford them thanks