Chevrolet 1977 light duty truck Service Manual page 29

Stan dard H e a t e r ............................................................................... 1A-1
Auxiliary H e a te r...............................................................................
Specifications...................................................................................... 1A-18
G e n e ra l D e s c rip tio n ............................................................. 1A-1
System C om ponents........................................................ 1 A - 1
System C ontrols............................................................... 1A-3
D ia g n o sis............................................................................... 1A-4
O n Vehicle Service
Blower M o t o r .................................................................... 1A-9
H eater Distributer and Core A ssem b ly ................. 1A-9
Heating components are attached to the dash panel
on the right side of the vehicle. The blower and air inlet
assembly and water hoses are located on the forward
side o f the dash panel while the heater core and
distributor duct are on the passenger side.
The heater system is an air mix type system in
SECTION 1A
HEATER
C O N T E N T S OF T H IS SEC TIO N
STANDARD HEATER
INDEX
H e a te r H o s e s .......................................................................... 1A-10
Center Distributor Duct - G M o d els..................... 1A-10
Left Distributor Duct - G M o d e ls .......................... 1A-10
Defroster D u c t ................................................................. 1A-10
Control A ssem bly............................................................ 1 A - 10
C on , rol C a b le s................................................................. 1A-11
Control C a b le s ................................................................. 1A-11
Blower Switch.................................................................... 1A-12
Blower Switch.................................................................... 1A-12
Resistor U n it..................................................................... 1A-13
GENERAL DESCRIPTION
which outside air is heated and then mixed in varying
amounts with cooler outside air to attain the desired air
temperature. The system consists basically o f three parts:
(1) the blower and air inlet assembly, (2) the heater
distributor assembly and (3) the heater control assembly.
Fig. 1A 1-H eater A ir Flow Schematic- G Models
1A-14