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16-2
PART
16·1
VENTILATING AND
HEATING
Section
1 Description and Operation
Ventilating System
Heating System
Page
16-2
16-2
16-2
Section
Control Adjustments
Blower Motor Electrical Circuit
Heater Hose Routing
2 Diagnosis and Testing
16 -3
Heater Hose Replacement
Bleeding Air From Heater Core
Removal and Installation
Pare
16- 5
16- 5
16-5
16-5
16-5
16-6
16-6
16-6
Ventilating
and Heating Trouble
Diagnosis
Guid~
16-3
Loose Motor Fan Test
Blower Switch Test
Plugged Heater Core Test
16-5
16-6
16-5
16-5
16-5
16-5
Heater -
Assembly Removal
Heater
-
Asembly Installation
3 Common
Adjustments and Repairs
Ventilating
System
Heating System
0
DESCRIPTION
AND OPERATION
VENTILATING SYSTEM
Two
ventilating
air outlet ducts
are located under and at each end
of the instrument panel; both ducts
are
open to the cowl air inlet plenum
chamber. Two manually operated
flap valves are located within the air
ducts. The flap valves are opened, to
allow the
entry
of fresh air into the
passenger compartment, by pulling
the respective left or right hand
knobs on the instrument panel
(Fig.
1).
Pull
knob
half way
out
for
floor
level
or full out
for face level.
HEATING SYSTEM
The heater is
a
blown system
connected
to
an opening
in the
left
hand
air
duct. The entire
heater assembly is located under the
instrument panel, and it is necessary
to remove the heater assembly to ser-
vice major components of the heater.
Outside air is drawn into the
vehicle from the cowl inlet through
the left-hand air duct into the heater
housing and through the heater core
and then discharged through outlets
in the distribution box or windscreen
demister outlets (Fig. 2).
AIR AND TEMPERATU1tE
CONTROL
The control assembly is located on
the dash panel in the instrument
cluster
assembly. It contains two
horizontal
slide levers and a blower
switch (Fig. 2).
The upper lever is used for con-
trolling mode position. The lower
lever is used for
controlling
air temp-
erature. The three-position switch
controls the two-speed motor and
fan. The air temperature is varied by
a temperature
control
door which
blends hot and cold air. A tap in the
engine compartment cuts off water
in the cold position.
As the temperature control lever
is moved- from the cold to hot
position, a Bowden
cable operates
the temperature
control
door to mix
hot
and
cold
air
through
the
heater.
The
air is
then
discharged into
the distribution chamber.
A
distri-
bution flap valve is located within
the chamber to control the
discharge
of air between the
interior
and the
screen and to close off
all
air
in
the off position.
The 1apper
control
lever actuates
a Bowden cable
connected
to the
flap
valve
in
the
distribution
chamber. Air
is
directed as required
through the interior air outlets or
through the demist outlets below
the windscreen.
The air flow distribution can thus
be modulated by
setting
the control
lever in any position between
"in-
terior" position and the "off" posit-
ion, varying the
volume
of air
erttering through the interior out-
lets. All air flow is cut off with the
control lever in the
"off"
position.
A single demist nozzle directs
the
air to two
slots
in upper dash panel
below the windscreen.
Two speeds are provided for the
blower with a 3 position
switch
in the control
assembly.
A resistor
located in the
motor circuit
controls
the
"lo" speed.
The
amount of
heating can be
varied by
the
two
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