Cadillac 60 Series 1963 Shop Manual page 382

HEATING AND AIR CONDITIONING
13-1
HEATING
The 1963 Cadillac is equipped with one of two
heat regulating systems. A new Air-Mixture sys-
tem is used on 60 and 62 series cars, while 75
series cars use the Water Control Valve system.
The construction features of the system used
differs, depending on whether or not the car is
equipped with Air Conditioning.
60 and 62 Series (Non-Air Conditioned)
The heating system for all 60 and 62 series cars
without Air Conditioning consists of a single heater
unit located on the right hand side of the dash
panel. This unit supplies warm air to the front
and rear passenger compartments, and to the
windshield for defogging and defrosting.
Outside air is drawn through the cowl air intake
grille into the ventilation duct and into the heater
blower and air inlet assembly, Fig! 13-1. The
heater blower then forces a portion of the outside
air through the heater core and into the ducting
system. The remaining air is forced directly into
the ducting system. To obtain the desired dis-
charge air temperature, the heated air then mixes
with the unheated air in the necessary proportions.
He at-conditioned air is delivered to the front of
the passenger compartment through duct openings
in the heater case, located, on the inside dash
panel. Heat-conditioned air for the rear com-
partment passes through a Y-duct that extends
rearward on top of the transmission tunnel, under
the front carpet and seat. Air for the defroster
system is discharged through two outlets in the
top of the heater case.
The temperature of the air discharged into the
car is controlled by a temperature valve, Fig.
13-1, inside the heater case. This valve regulates
the proportions of heated and unheated air which
mix. Water enters the heater core through the
lower fitting, and leaves the heater core through
the upper fitting. The water control valve is used
only to prevent water flow when the heater is
OFF.
The heater-ventilation control panel, Fig. 13-2,
is located below the instrument cluster to the left
of the steering column. The four-position fan
switch turns the blower ON and OFF, and controls
the three blower speeds.
The heater-defroster lever, when advanced to
the "Heat" position, vents the vacuum-operated
air inlet valve, Fig. 13-3, that admits outside air
to the heater unit, and opens the water control
valve. At the same time the electrical circuit to
the fan switch is completed. Advancing the lever
past "Heat" to the "De-Fog" position opens the
defroster valve in the heater case to position 1,
Fig. 13-4. A portion of the heat-conditioned air is
then directed into the defroster ducts, while the
remaining portion is discharged into the passen-
ger compartment. Advancing the lever past "De-
Fog" to the "De-Ice" position opens the defroster
valve to position 2, Fig. 13-4. All of the heat-
conditioned air is then directed into the defroster
ducts. In all positions, air volume is controlled
by the fan switch.
The temperature lever operates the tempera-
ture valve, Fig. 13-1, that controls the tempera-
ture of the discharged air by regulating the mixing
Water Pump Feed Hose
5/8" I. D.
Blower and Air Inlet
Assembly
Outlet
Fitting
Return Pipe
3/4" O.D.
Return Hose
3/4" I. D.
To Defrosters
Outside
Air
t o Rear
Passenger
Compartment
Heater
Core
Fig. 13-1 Front Unit Heater Assembly - 60 and 62 Series