Buick 1993 Roadmaster Owner's Manual page 132

Howev~r, 'il
you want the
blower fan
f.0
run at a low&
speed, pukh
v.
If
you. want' to raise the
bloWer"spt%d,
push
A,
.
..'
. .
4
,
! '
You can use this when you don't need to cool the
outside-air. The system will work as in the AUTO mode
without cooling. The air flow will come from the
instrument panel outlets.