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 196 of 524
TB 9-2320-279-13-1
0015-28
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 condenser dryer OK.
No restricted AC hoses.
POSSIBLE PROBLEMS
AC expansion valve faulty.
AC evaporator core faulty.
20.
Is AC expansion valve free
from excessive sweating and
frost?
Recover R-134a
refrigerant (WP 0050).
Replace AC expansion
valve (WP 0030) 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 0015-29.
WARNING
Recover R-134a refrigerant
(WP 0050).
Replace AC
evaporator core (WP 0030)
and AC condenser dryer
(WP 0025).
Evacuate and
charge system (WP 0050).
Verify repair, go to Step 22 of
this fault.
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TEST OPTIONS
Visual inspection.
REASON FOR QUESTION
If AC expansion valve is free
from excessive sweating
and frost, AC evaporator
core is faulty.
If not, AC
expansion valve is faulty.
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