1993 Buick Roadmaster Owner's Manual - Page 132
1993 Buick Roadmaster Manual
Page 132 highlights
Howev~r, you wantthe 'il blower fanf.0 run at a low& speed, pukh v. If you. want' raise the to bloWer"spt%d,push A, . . 4 , !' . ..' You can use this when you don't need to cool the outside-air.The system will workas in the AUTO mode without cooling. Theair flow will comefrom the instrument panel outlets.
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