Chevrolet 1980 Light Duty Truck Service Manual page 54

1 B-8 AIR C O NDITIO NING
COMPRESSOR
OFF O FF
MAX ON
NORM
ON
Bl LEV ON
VENT
OFF
HEATER O FF
DEFR O N *
"PR O VIDED COMPRESSOR PRESSURE SWITCH CLOSED
expansion. If the R-12 drum were completely full and the
temperature was increased, tremendous hydraulic force
could be developed.
BLOWER
AIR
SPEEDS
SOURCE
A V A IL
O U T S ID E
NONE
A L L IN S ID E %
O U T S ID E
A L L
A L L O U T S ID E
A L L O U T S ID E
A L L O U T S ID E
A L L O U T S ID E
Fig. 1B-8--System O peration - G M odels
Fig. 1B-9~Vacuum Schem atic - G M odels
HEATER
AIR
ENTERS DEFROSTER
VEHICLE DOOR
OPEN TO
F LO O R O U T LE T S
H E A T E R
DASH O U T LE T S H E A TE R
H E A T E R
DASH O U T LE T S
DASH O U T LE T S
H E A T E R
F LO O R O U T L E T S
DASH O U T L E T S
H E A TE R
B LE E D TO DEFR O ST
& F LO O R O U T L E T S
D EFR O ST
D E FR O S T O U T L E T S
CAUTION: Avoid breathing smoke and
fumes produced by the burning of the
Refrigerant-12.
hazardous.
HEATER
A/C
DOOR
OPEN TO
H E A T E R -D E F
A /C
A /C
A /C &
H E A TE R
H E A T E R
A /C
H E A T E R
H E A T E R
Such fumes may
LIG H T T R U CK S ER V IC E M AN U AL
be