Cadillac 60 Series 1963 Shop Manual page 394

HEATING AND AIR CONDITIONING
13-13
When the upper selector lever is moved to the
"Cool" position, the electrical circuit to the
compressor clutch is closed. Current flowing
through the coil creates a magnetic force that
draws the armature plate (which is ahead of the
pulley assembly) rearward toward the pulley.
As the armature plate moves toward the pulley
it contacts the pulley face, which is rotating free-
ly on the compressor front head.
The magnetic force locks the armature plate
and pulley together as one unit. The compressor
shaft then turns with the pulley, causing the com-
pressor pumping action needed to operate the
system.
When the selector lever is moved to the OFF
position, the armature plate hub actuating springs
move the armature plate away from the pulley.
If the Air Conditioning system was in use when
the engine was turned off, the armature plate may
remain in contact with the pulley due to residual
magnetism. This will cause no trouble, as the
armature plate and pulley will separate as soon
as the engine is started.
Suction Throttling Valve
The vacuum-operated suction throttling valve
is located on the top front side of the evaporator
case, Fig. 13-14, in the low pressure line to the
Expansion
~ " Valve
Air Conditioner-Heater Control Panel \
•Air Outlets
Fig. 13-11 Location of Air Conditioner Components - 60 and 62 Series