Cadillac 60 Series 1963 Shop Manual page 398

HEATING AND AIR CONDITIONING
13-17
Liquid refrigerant is metered into the core
through an inlet pipe at the bottom of the core.
This inlet pipe serves to distribute an equal
amount of liquid refrigerant to each tube of the
core. The cooling core in the evaporator is the
actual cooling unit of the system. This is the only
place in the system where refrigerant is intended
to change from a liquid to a vapor state. Warm
air passing through the core is cooled before
being discharged into the passenger compartment.
The rear evaporator on 75 series cars operates
in a similar manner, although differing slightly
in internal construction details.
Blower Assembly
The heater-Air Conditioner blower assembly
is mounted on the front right side of the dash.
The blower motor has four speeds: low, medium
low, medium high, and high, which are governed
by resistors. The resistors are located on the
right top side of the heater-Air Conditioner as-
sembly inside the car. The blower motor is air
cooled by the blower's own output. A tube between
the blower case and the blower motor allows part
of the blower output to pass through the motor
case and exhaust through an opening on the op-
posite side of the motor. A rubber tube at the
exhaust prevents dirt and moisture from entering
the motor. On 75 series cars, air from the rear
evaporator unit is circulated by two blowers, one
on either side of the unit.
The front blower assembly draws outside air
in through the cowl vent, or air from the pass-
enger compartment through an opening in the
dash, depending upon the setting of the upper lever
in the heater-Air Conditioner control panel.
Control Panel
The Air Conditioner-heater control panel, Fig.
13-15, is located below the instrument cluster to
the left of the steering column. The panel consists
of two horizontal sliding levers and a toggle
switch.
Fig. 13-15 Heater-Air Conditioner Control Panel
The selector (upper) lever directs the flow of
air and the temperature (lower) lever controls
the temperature of the air. The toggle switch on
the upper center of the control panel regulates
the blower speed.
Moving the selector lever to the "Cool" posi-
tion turns the blower and compressor on. The
air directional valves are activated, delivering
100% outside air to the system. When the lever
is moved to the "Recirc" position, the air direc-
tional valves deliver 20% outside air mixed with
80% recirculated air for maximum cooling ef-
ficiency.
Moving the temperature lever to the left re-
duces the air temperature by regulating the temp-
erature valve and by controlling the vacuum
circuit to the suction throttling valve and the
water control valve.
Vacuum Circuit
The 1963 Cadillac 60 and 62 series Air Condi-
tioning system incorporates two vacuum circuits,
Fig. 13-16. The air circulating circuit, regulated
by the selector (upper) lever on the control panel,
is controlled by three air valves and two vacuum
power units; the 20%-100% unit and the heater-
Air Conditioner unit. The selector lever also
activates the vacuum power unit to the carburetor
fast idle.
The temperature circuit, regulated by the temp-
erature (lower) lever, is controlled by the temp-
erature valve and two vacuum power units; the
water control valve vacuum power unit and the
suction throttling valve.
The vacuum circuits on 75 series cars, Fig.
13-17, differ in thatj the air circulating circuit
is controlled by two air valves and three vacuum
power units; the 20%, the 100%, and the heater-
Air Conditioner vacuum power units. The temp-
erature circuits are controlled by suction
throttling valves mounted on the front and rear
evaporator assemblies, which are regulated by
the vacuum modulator equipped temperature
levers.
Vacuum is furnished by the engine for the oper-
ation of these units. A check valve, located on the
dash insulator to the left of the steering column,
assures operation of the units during periods of
low vacuum caused by wide carburetor throttle
opening.
Operation (60 and 62 Series)
With the selector (upper) lever in the "Off"
position, the air inlet valve is closed, and the
heater-Air Conditioner valve and diverter valve
are in the heater position, Fig. 13-16.