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SECTION 1A
HEATER AND AIR CONDITIONING
CONTENTS OF THIS SECTION
Heater
Air Conditioning
Page
1A-1
1A-13
HEATER
GENERAL DESCRIPTION
CHEVROLET, CHEVELLE, AND CAMARO
Components of the Chevrolet, Chevelle, and Camero
heaters are attached to the firewall on the right side of
the vehicle. The blower and air inlet assembly and water
hoses are located on the engine side of the firewall while
the heater core and distributor duct are on the passenger
side.
The heater operates on outside air only with the
blower receiving its airflow from the cowl vent plenum
chamber.
Since the unit has no water valve, water circulation
keeps the core hot at all times. Air passing through the
core receives maximum heat from the core.
In operation, three levers control all heater opera-
tions. The AIR-FAN lever is a combination control;
moving the lever half-way opens the AIR door (by means
of a bowden cable) to supply outside air to the three
speed blower. Further movement of the lever operates
the blower. The other levers depend on bowden cables to
operate the diverter doors located in the distributor
duct to control heater output and operation.
At the heart of the heater operation is the temperature
door. Air from the blower follows parallel paths through
the distributor duct, with one path passing through the
heater core and the other path bypassing the core. The
temperature door, operated by the TEMPERATURE con-
trol lever, is placed in the duct so that when it closes off
the path from the heater core, it allows ambient airflow
through the unheated path. In the opposite position only
heated airflow is allowed. Final heater output tempera-
ture is dependent upon the proportion of heated and
unheated air blended together according to the setting of
this temperature door. To insure positive closing of this
door when the heat lever is in the off position, a cam
lock device is utilized in the control linkage of the
Chevelle heater only.
Just beyond the temperature damper door is the Air
door, operated by the AIR-FAN control lever, which is
the air on-or-off control. This door will be open when-
ever the heater blower is in operation.
The defroster door, operated by the DEFROSTER
lever, acts to divert the heated air flow up through the
defroster ducts for de-fogging, defrosting or de-icing
operations.
Figures 1 and 2 illustrate airflow through the heater.
BLOWER
DEFROSTER
OUTLET
DASH
PANEL
OUTSIDE AIR FROM
COWL PLENUM DUCT
HEATER
OUTLET
DOOR
DOOR
Fig.
1 — Heater Air Flow (Chevrolet, Chevelle, Corvette, Camaro)
CHEVROLET CHASSIS SERVICE MANUAL
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