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11-30
HEATER
RADIO AND OTHER ACCESSORIES
(426
)
AIR OUTLET VAlVES
-
-- - - - - - .
DEFROSTER OUTLETS
BLOWER SWITCH
-
-
-
,
AlR OUTLET
CONTROL KNOB. TO OPEN VALVES
PULL
OUT
ON THLS KNOB
.
HEATER AIR INTAKE VALVE
CONTROL KNOB, TO PERMIT AIR
TO PASS THRU
HEATER,
PULL
OUT ON THIS KNOB
.
DEFROSTER AIR INTAK
E
VALVE
CONTROL
KNOB.
TO P
ERMIT
AIR
TO PASS THRU DEFROSTER,
PULL CUT ON THIS KNOB
.
CLOSING
Of
HEATER VALVE
INCREASES
AIR
FLOW
T
HRU
OEFROSTER.
AIR OUTLET AND
OEfLECTOR
-
-
-
-
-
-
-
AIR
DISTR1BUTK>N HOUSING
UNDER SEAT HEATER UNIT
FORCED AIR BLOWER UNIT
NECESSARY,
AT
CA
R SPEEDS OF LE
SS
THAN 30
MILES
PER HOUR TO PROVIDE
PROPER AIR
FLOW THRU
THE HEATER UNIT
HEATER AIR INTAKE VALVE
DEFR
OSTER
AIR INTAKE VALVE
AIR OUT
L ET AND DEFLE
CTOR
.
'----
-
-
-1
MA
X.
AI
R FLOW OBTAI NED
BY
CLO SING
H
EA TER
AND DEFROS TER
VALVES.
A
UTOMA
TIC CA
R TEt.4PER
ATURE
CONT
ROL
UNIT.
TEMPERATURE CONTROL ADJUSTING
KNOB
.
CAR TEMPERATURE MAY BE
MA
INTAINED
AT ANY DESIRED POINT
.
UNIT IS SHOWN IN OFF POSITION
.
TO INCREASE CAR TEMPERATURE
TURN KNOB
CLOCK-WiSE
.
ONCE
SET.
OPER
ATI ON
I
S ENTIRELY
AUTOMATIC
.
TURN
K
NOB TO
EXTREJ.4E
COUN TER-
CL
OC
K-W
ISE.
POS
ITION
fOR SUJ.4J.4ER
DRIVING.
Figure
11
~2
8-Heater.
Defroster, and Air
Ventilators-
1949 Series 50-70
lated by the temperature control unit when the
heater
air intake valve is open. The control
unit contains a thermostatically actuated
valve
which
regulates
the flow of hot water between
th
e
eng ine and heater unit to maintain a uni-
form car temperature. It is manually adjusted
for
desired
car temperature by a knob, marked
"WARMER", located at lower edge of instru-
ment panel.
Turning the control knob clockwise in-
creases
the car
temperature
and turning knob
counterclockwise
decreases t
emperature.
The
last few
degrees
of motion of adjusting knob
in the full clockwise direction cuts out the
automatic control feature and holds the control
unit valve wide open to give maximum water
flow with
consequent
maximum heat. This fea-
ture
is to
provid e
unrestricted flow of hot water
to
the defroster
unit when maximum defroster
capacity is r
equired
for de-icing
windshield.
At this
time
the temperature of the car may
be reduced by adjusting the heater air intake
valve to restrict flow of air through
heater.
Hot water flow through
the
heater and the
defroster units is completely shut off by a full
counterclockwise rotation of the control unit
adjusting knob. This shuts off all heat when
not des
ired,
such as for summer driving. This
feature eliminates the need for a
shut-off
valve
In
water line at
engine.
b
. Heat Dist r ibution
The amount of air
forced
into the car
through
the
heater unit, particularly when the
car is moving forward, is
dependent
to some
extent
on the door window and ventilator
openings. With all windows and ventilators
closed, the flow of air is restricted and dis-
tribution of heated air is not sufficient to heat
the car properly. See figure 11-29.
With door windows closed and one or more
ventilators opened approximately
Y:/',
the flow
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