TB-9-2320-279-13-1
TECHNICAL BULLETIN; AIR CONDITIONING SYSTEM
OPERATOR’S, UNIT AND DIRECT SUPPORT MAINTENANCE MANUAL, INSTALLATION INSTRUCTIONS, AND REPAIR PARTS AND SPECIAL TOOLS LISTS
DECEMBER 2005
TB-9-2320-279-13-1 - Page 194 of 524
TB 9-2320-279-13-1
0015-26
AC DOES NOT COOL OR COOLS INADEQUATELY - Continued
DRAFT
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KNOWN INFO
Power to AC system OK.
AC heater/evaporator blower OK.
AC control circuits OK (except for
temperature control and low pressure
switches).
No moisture in AC refrigerant system.
AC low pressure switch OK.
No AC condenser dryer desiccant
contaminant in AC refrigerant system.
No AC refrigerant oil contaminant in AC
refrigerant system.
AC system charge is not low.
No AC system leaks.
Temperature control switch OK.
No air or other contaminant in AC refrigerant
system.
AC compressor OK.
AC condenser core OK.
AC system not overcharged.
AC evaporator core OK.
No restricted AC hoses.
POSSIBLE PROBLEMS
AC expansion valve faulty.
AC condenser dryer faulty.
18.
Is AC condenser dryer free
from frost, sweating, and cool
spots?
NO
YES
Read WARNING on
page 0015-27.
WARNING
TEST OPTIONS
Visual inspection.
REASON FOR QUESTION
If AC condenser dryer is free
from frost and cool spots,
AC expansion valve is
faulty.
If not, AC
condenser dryer is faulty.
Recover R-134a
refrigerant (WP 0050).
Replace AC condenser
dryer (WP 0025).
Evacuate and charge
system (WP 0050).
Verify repair, go to
Step 22 of this fault.
Recover R-134a refrigerant
(WP 0050).
Replace AC
expansion valve (WP 0030)
and AC condenser dryer
(WP 0025).
Evacuate and
charge (WP 0050).
Verify
repair, go to Step 22 of this
fault.
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KNOWN INFO
Power to AC system OK.
AC heater/evaporator blower OK.
AC control circuits OK (except for
temperature control and low pressure
switches).
No moisture in AC refrigerant system.
AC low pressure switch OK.
No AC condenser dryer desiccant
contaminant in AC refrigerant system.
No AC refrigerant oil contaminant in AC
refrigerant system.
AC system charge is not low.
No AC system leaks.
Temperature control switch OK.
No air or other contaminant in AC refrigerant
system.
AC compressor OK.
AC condenser core OK.
AC system not overcharged.
AC evaporator core OK.
POSSIBLE PROBLEMS
Restricted AC hose.
AC expansion valve faulty.
AC condenser dryer faulty.
19.
Is AC hose from AC
evaporator core to AC
compressor free from frost
and cool spots?
Recover R-134a
refrigerant (WP 0050).
Replace restricted AC
hose (WP 0040) and
AC condenser dryer
(WP 0025).
Evacuate
and charge system
(WP 0050).
Verify
repair, go to Step 22 of
this fault.
NO
YES
Read WARNING on
page 0015-27.
WARNING
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TEST OPTIONS
Visual inspection.
REASON FOR QUESTION
If frost or cool spots are
forming on AC hose, AC
hose is restricting R-134a
refrigerant flow.
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