...(wild ass guess): Something is causing the ACC to default to full defrost. I'm thinking something loose that causes a short in the control unit during that specific maneuver?

Anybody know of any wiring that might be getting pulled when turning the column hard left?

Just an "out loud" thought here...

Kevin

__________________
"Dangerous with a wrench...and not smart enough to know it"

Stable (in order of acqusition):
'84 500SL, 280SEL (Euros)
'77 280SE. '90 560SEL
'79 450SEL 6.9,
'95 C280 (totalled by daughter 8/07)
'81 280SL (rescued) '88 300CE
'86 560SEC '95 C36
'01 CL55

DD's: '04 S500 4Matic (SWMBO)
'04 F150 Crew