Cadillac 60 Series 1963 Shop Manual page 401

13-20
HEATING AND AIR CONDITIONING
Suction Throttling Valve
Air Inlet Valve
Blower Inlet Assembly
20%-100% Vacuum Power Unit
Recirc. Position
Heater Core
Heater-Air Conditioner
Vacuum Power Unit
Temperature Valve
Diverter Valve Hearer-Air Conditioner Valve
Air Conditioner Cross-Car Duct Heater-Air Conditioner Assembly Cooling Coil
Fig. 13-18 Heater and Air Conditioner Vacuum Circuit (COOL Position) - 60 and 62 Series
Cycle of Operation (Fig. 13-23)
The refrigerant compressor, belt-driven by the
engine, furnishes the pumping action necessary
to operate the system. When the control lever is
set for Air Conditioning, and the engine and com-
pressor are operating, low pressure vapor is
drawn into the compressor, where it is com-
pressed to a high pressure, high temperature
vapor and forced into the condenser, located in
front of the radiator. In the condenser, the vapor-
ized refrigerant is changed to a high pressure,
high temperature liquid as its latent heat escapes
to the lower temperature air drawn through the
condenser by the engine fan.
This high pressure liquid from the condenser
is then forced into the receiver tank, where the
last of the bubbles condense so that they will not
pass through the system. From the receiver,
the liquid flows through the sight glass and the
high pressure liquid line to the expansion valve
on the evaporator assembly.
The high pressure liquid then changes to a low
pressure liquid and vapor as it forces its way
through the valve into the inlet pipe of the evapor-
ator. The refrigerant is then distributed to the
tubes of the cooling coil.
Meanwhile, warm outside air passes over the
cooling coil due to the action of the blower fan.
Some of the heat from this air passes through
the cold tubes of the cooling coil and into the
liquid refrigerant, causing the liquid to vaporize.
This vapor is drawn through the suction throttling
valve and then through the large diameter low
pressure line and back to the compressor, where
the cycle is repeated.
Fast Idle
Vacuum
Power Unit
20%
Vacuum
Power Unit
To
Passenger Air From Heater
Compartment Cowl Vent
Fig. 13-19 Heater and Air Conditioner Vacuum Circuit
(Cool Position) - 75 Series