Buick LeSabre 1965 Service Manual page 843

1 1 - 1 1 0 OPTIONAL HEATER-AIR CONDITIONER SYSTEM
ACCESSORIES
COMPLAINT AND CAUSE
(b) Low suction pressure
(c) Defective compressor and/or broken
compressor reed valves
4. Evaporator Pressure Too High
(This will be accompanied by air outlet
temperature at outlet too high.)
(a) Expansion valve capillary tube bulb not
tight to evaporator outlet tube.
(b) Expansion valve improperly adjusted or
inoperative.
(c) Suction throttle valve adjusted improp-
erly or defective
(d) Vacuum Modulator defective (49000)
5. Evaporator Pressure Too Low
(a) Expansion valve capillary tube broken,
inlet screen plugged or valve otherwise
failed
(b) Restriction in system tubes or hoses.
(c) Suction throttle valve adjusted improp-
erly or defective
NOTE: It compressor suction line from STV is
tor, this indicates that STV outlet pressure
defective.
CORRECTION
(b) See EVAPORATOR PRESSURE TOO LOW.
(c) Repair compressor.
(a) Check for tightness.
(b) Replace valve.
(c) Check operation of STV, paragraph 11-15,
subparagraph "V. R e p a i r valve, if
necessary.
(d) There should be no vacuum to STV when
air conditioner temperature control lever
on COOLER position and FAN switch lever
on HIGH position. Replace vacuum modu-
lator if defective.
(a) Replace valve or clean inlet screen of
valve.
(b) Replace kinked tube or restricted hose.
(c) Check operation of STV, paragraph 11-15,
subparagraph "f". Repair if necessary.
extremely colder than STV inlet line from evapora-
is much lower than inlet pressure and STV may be