Chevrolet 1980 Light Duty Truck Service Manual page 52

CO N D ITIO N E D AIR IS DIRECTED TH R U W/SHLD,
I .P. & FLOOR DISTRIBUTOR OUTLETS
C O N D ITIO N E D AIR IS DIRECTED THRU I.P. OUTLETS
IN THIS MODE LEVER POSITION, M A X IM U M
COOLING IS OFFERED WITH THE CO NDITIO NED
AIR DISTRIBUTED THRU I.P. OUTLETS A T
" H I" BLOWER SPEED.
L IM IT E D AIR FLOW DISTRIBUTED
TH RU I.P. OR W/SHLD. OUTLETS
WHENEVER IG N ITIO N IS IN A
" R U N " OR " O N " POSITION.
4 SPEED FAN
CONTROL LEVER
VACUUM OPERATED SYSTEM
SELECTOR (MODE) LEVER
A NON-COMPRESSOR OPERATING POSITION,
W ITH OUTSIDE AIR D E LIV E R E D TH R U I.P. OUTLETS
A NON-COMPRESSOR OPERATING POSITION,
WITH OUTSIDE AIR DISTRIBUTED ABOUT
80% TO FLOOR & 20% TO W/SHLD
TEMPERATURE LEVER POSITION REGULATES TEMPERATURE
OF THE A IR ENTERING THE PASSENGER COMPARTMENT BY
CABLE OPERATION OF THE HEATER CORE TEMPERATURE DOOR
C O N D ITIO NE D AIR
DISTRIBUTED ABOUT
80% TO W/SHLD.
& 20% TO FLOOR