Chevrolet 10 Series 1967, Service Manual

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SECTION 1A
HEATER AND AIR CONDITIONING
CONTENTS OF THIS SECTION
Page
Heater .................................................................. ... 1A-1
A ir Conditioning ................................. ........................... 1A-10
HEATER
INDEX
Page Page
General Description............ ............................................. 1A-1 Control Assembly ....................................................... 1A-8
Component Replacement and R e p a i r .............................. 1A-4 Control C a b l e s ............................................................. 1A-8
Blower Assem bly.......................................................... 1A-4 Blower Switch................................................................ 1A-9
Blower, Core Case, and Core A s s e m b l y .................. 1A-5 Thermostatic V a lv e ............................ .. ....................... 1A-9
GENERAL DESCRIPTION
O U T L E T S
Fig . 1 - Deluxe A ir H eater Schematic
DELUXE AIR HEATER
Components of the heater attach to the right side of the
firewall. The blower motor, heater core, and hose as­
sembly mount on the engine side of the firewall while the
distributor ducting, and controls are under the dash (fig.
1
).
The heater operates on outside air only with the blower
receiving its airflow from the cowl vent plenum chamber.
Engine coolant constantly flows through the heater core
during engine operation. Heater output is adjusted by
varying the airflow through the system. A dash mounted
three lever control system is employed (fig. 2). One
lever controls the defroster air deflector. The second
lever opens the air door and operates the three speed fan
switch. The third lever operates a temperature door
which passes the airflow either through the heater core,
around the core, or partially through and partially around
the core.
CHEVY VAN HEATER
The Chevy Van heater assembly is mounted on the toe
board inside the van. Outside air flows to the heater
through a grille in the front end panel and across to the
heater air inlet (fig. 3). The air passes by the tempera­
ture door where it is directed either through the core,
bypassed around the core, or split between the two to
vary the air temperature. The bypass channel is a de-
CHEVROLET TRUCK SERVICE M ANUAL