I've never been able to detect ANY flow on my '86 from this lever.  It's
only use (I can tell) is to reduce the VERY loud "rushing air noise" 
from the dash when all the other levers are closed.  It seems desirable
to keep this closed when running the A/C, but I can't stand the noise ...

 >The REAR CEILING AIR FLOW is controlled by the bottom (#4) lever.  Left is
 >open, right is closed.  Rear ceiling air is not heated.  (Again, there's a
 >little picture trying to convey this.)

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Frank Terhaar-Yonkers,  Manager
High Performance Computing and Communications Research
MCNC
PO Box 12889	3021 Cornwallis Road
Research Triangle Park,  North Carolina  27709-2889
fty@mcnc.org   voice (919)248-1417   FAX (919)248-1455

http://www.mcnc.org/hpcc.html