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RADIO AND OTHER ACCESSORIES
HEATER
11-29
SECTION
II-B
ACCESSORIES OrHER THAN RADIO
CONTENTS OF SECTION 11-B
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Page
11-8
Heater and Windshield Defroster 11-29
11-9
Automatic Windshield Washer
..
11-33
11-10 Back Up Lamps and Switch ..
. .
11-34
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11-11 Safety
(Spot)
Light
. . .
. . .
.
. .
.
.
11-35
11-12 Auxiliary (Fog) Lamps
. .
.
. .
. ..
11-36
11-13 Rear Window Wiper
11-36
SERVICE BULLETIN REFERENCE
Bulletin No.
Page No.
SUBJECT
11 -8 HEATER AND WINDSHIELD
DEFROSTER
a. Description of Heater and Defroster
The heater and the defroster are separate
units which may be operated together or inde-
pendently as desired. The heater and defroster
installation is an automatically controlled hot
water system which uses forced air to insure
positive distribution of heat.
The hot water supply is taken from the radi-
ator thermostat housing on the outlet side of
engine water pump and is returned to engine
cooling system on the inlet side of water pump.
Through connecting hoses, the water pump cir-
culates hot water through a temperature con-
trol unit on the dash, the defroster unit core
mounted on the dash under the cowl, and the
heater unit core located under the front seat.
See figures 11-27 and
n
-28.
Only outside air passes through the heater
unit to be heated and distributed through in-
terior of car. The outside air is brought in from
behind the radiator grille through an air in-
take duct built into the right front fender
skirt. This duct is also used in the separate
ventilating system. The flow of air to the heater
unit is controlled by an air intake valve which
is manually operated by a Bowden wire con-
nected to a knob on the instrument panel.
An electric blower is provided to insure a
positive supply of outside air to the heater unit
at car speeds below 30 MPH. At car speeds
above 30 MPH the blower may be shut off, if
desired, as the heater unit will be supplied
with sufficient outside air due to car velocity.
In 1948 models, the heater blower is located
N'st forward of the heater unit and supplies
outside air to the heater unit only. A separate
electric blower is built into the defroster unit.
This blower forces air from inside the body
through the defroster core and upward through
two hoses to two outlets in the garnish molding
at lower edge of windshield. Each blower is
controlled by a separate switch on instrument
panel. See figure 11-27.
In 1949 Series 50-70, the heater blower is
located in the front end of the outside air
intake duct so that it can supply outside air
to both the heater and the defroster units. The
blower is controlled by a switch on instrument
panel. See figure 11-28.
In 1949 Series 50-70, the flow of air to each
unit is controlled by a separate air valve man-
ually operated by a Bowden wire connected
to a knob on instrument panel. Heated air
from the heater unit is distributed by an air
distribution housing mounted above the heater
unit. Heated air from the defroster unit is
conducted through a hose to a manifold built
into the cowl, from which it flows through
openings which distribute heated air evenly
over inside surface of windshield.
The car temperature is automatically regu-
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