Cadillac 60 Series 1963 Shop Manual page 447

13-66
AIR CONDITIONER DIAGNOSIS CHART (Cont'd.)
Condition
Temperature of discharge air
cannot be varied with lever on
c o n t r o l p a n e l . (60 and 62
series)
Temperature of discharge air
cannot be varied with lever on
control panel. (75 series)
Rear outlet air temperature
less than 19°F lower than re-
turn air t e m p e r a t u r e . (75
series)
Low head pressure as indi-
cated by performance test.
Possible Cause
Bowden cable to temperature
valve loose or disconnected.
No vacuum to water control
valve - valve remains in closed
position.
Water control valve stuck in
closed position.
Defective vacuum modulator on
Air Conditioner contfol panel.
Pinched, kinked or discon-
nected vacuum hose to suction
throttling valve.
Inoperative suction throttling
valve - will not r e s p o n d to
change in vacuum.
Defective vacuum modulator on
rear Air Conditioner control
panel.
Return air boot disconnected
or loose.
Rear evaporator suction throt-
tling v a l v e not a d j u s t e d
properly.
Expansion valve not operating
properly.
Fresh air intake doors (rear)
not operating properly.
Insufficient r e f r i g e r a n t in
system.
Suction throttling valve or ex-
pansion v a l v e s t u c k open -
allowing too much refrigerant
flow to compressor.
Compressor not pumping at
full capacity.
Remedy
Connect and a d j u s t bowden
cable.
Check vacuum c i r c u i t for
pinched, damaged, or discon-
nected hoses.
Check operation of vacuum
check valve and vacuum con-
trol s w i t c h . R e p l a c e if
necessary.
Replace water control valve.
Replace water control valve.
Replace vacuum modulator.
Connect hose or r e p l a c e if
damaged.
Repair or r e p l a c e suction
throttling valve.
Replace vacuum modulator.
Connect air boot or tighten
clamp.
Adjust suction throttling valve.
Replace expansion valve.
Adjust bowden cables.
Leak test, repair and recharge
system.
Adjust or repair suction throt-
tling valve - replace suction
throttling valve or expansion
valve if necessary.
Repair compressor.