Cadillac 60 Series 1963 Shop Manual page 446

13-65
AIR CONDITIONER DIAGNOSIS CHART (Cont'd.)
Condition
Insufficient cooling - Air from
Air Conditioner outlets is not
cold. (Cont'd.)
Possible Cause
Expansion v a l v e stuck wide
open - allowing too much flow
of refrigerant to evaporator.
Expansion valve inlet screened
clogged, restricting flow of re-
frigerant to evaporator.
Clogged dehydrator receiver.
Condenser air flow reduced by
bugs, leaves, etc. - indicated
by high head pressure.
Insufficient c o n d e n s e r a i r
flow - d e f e c t i v e engine fan
clutch.
Excessive refrigerant in sys-
tem - indicated by high head
pressure.
Excess oil in system.
Air in refrigeration system -
indicated by non-equalization
of high and low side pressures
overnight.
Refrigerant hose or tubing col-
lapsed, kinked or otherwise
damaged interferring with flow
of refrigerant.
Compressor inlet s c r e e n at
suction fitting clogged.
C o m p r e s s o r not pumping
sufficiently.
Compressor i n o p e r a t i v e -
seized.
System uses outside air only
and will not switch to recircu-
lated air - which gives maxi-
mum cooling capacity.
Water control valve on 60 and
62 series cars remains open
in maximum cooling position.
Mispositioned t e m p e r a t u r e
valve.
Leakage of hot air into passen-
ger compartment through dash
or floor pan o p e n i n g s , at
grommets, around door open-
ings, in shroud sides at vent
duct o p e n i n g s , through or
around heater, etc.
Remedy
Replace expansion valve.
Clean screen - also clean com-
pressor inlet screen.
Replace unit.
Clean condenser.
Replace clutch.
P u r g e excessive refrigerant
from s y s t e m and recharge
system to correct amount.
Remove oil as required.
Purge air from high side fit-
ting until pressures equalize.
Replace d a m a g e d h o s e or
tubing.
Clean screen - also clean ex-
pansion valve screens.
Repair compressor.
Repair or replace compressor.
Check and repair vacuum sys-
tem to obtain proper "Cool"
and "Recirc" operation.
Check to assure that vacuum to
valve diaphragm is cut off at
maximum cooling position.
Check operation of v a c u u m
control s w i t c h . Replace if
necessary.
Replace water control valve.
Adjust or repair temperature
valve.
Correct leakage of hot air into
car from whatever source.