Chevrolet 1977 light duty truck Service Manual page 44

Fig. 1A -18-W ater Valve In sta lla tion - G Model Shown
as Typical
Hi------------ 1
n MEDl
U
i D
|BAT_____
BLOWER
SWITCH
n
,50 0 ^ ,2BI,N
16 BRN{
■
"CK" I G N # 3 - 3 0 0 UNFUSED
j
" G " IG N A C C # 4 FUSED
FUSE
PANEL
Since a detailed list o f installation instructions is
included with the auxiliary he a te r unit, replacement
procedures will not be repeated in this section.
I N S T A L L V A L V E W I T H A R R O W
P O I N T I N G A W A Y F R O M TEE.
O R I E N T V A L V E S O " O N " " O F F "
IS VISIBLE
CIRCUIT
OFF B AT -O NL Y
LO
LO BAT-LO
MED BAT-MED
MED
HI BAT-H I
HI
L O
- 1 4 O R N -
-1 4 YEL-
12 BRN
I
5 0 C
15 AM P
INLINE FUSE
5 0 A
OB]
s
Fig. 1A-20-E lectrical Diagram - All Models
ON VEHICLE SERVICE
Fig. 1A 19--A uxiliary Heater Control
HEATER OPERATION
BAT-BLO SW-RES Rl R2-
BLO M TR-G RD
BAT-BLO SW-RES R2-
BLO M TR-G RD
BAT-BLO SW -
BLO M TR-G RD
-1 4 LBL-
CAUTION: G M odels--W hen replacing heater
hoses, m aintain a 1 /2 " m inim um clearance
between hose clip and upper control arm, a
v/\ZV\Arf
Rl
v W i
BLOWER
R2
L RESISTOR
b l c l
I " I
m e d l o
51
5 2A
5 2B
14 ORN
|52B|
[ 5 2 ]
14 B
M H 1
BLOWER
GRD (o
M O TO R