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 186 of 524
TB 9-2320-279-13-1
0015-18
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).
AC low pressure switch OK.
No AC condenser dryer desiccant
contaminant in AC refrigerant system.
No AC refrigerant oil contaminant in AC
refrigerant system.
No AC system leaks.
Temperature control switch OK.
No air or other contaminant in AC refrigerant
system.
AC condenser dryer OK.
AC evaporator core OK.
No restricted AC hoses.
AC compressor OK.
POSSIBLE PROBLEMS
AC condenser core faulty.
Moisture in AC refrigerant system.
AC expansion valve faulty.
AC system overcharged.
12.
Is AC condenser output hose
hot?
NO
YES
Read WARNING on
page 0015-19.
WARNING
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TEST OPTIONS
Visual inspection.
REASON FOR QUESTION
If AC condenser output hose
is hot, AC condenser is
faulty.
Go to Step 13 of this
fault.
Recover R-134a refrigerant
(WP 0050).
Replace AC
condenser core (WP 0024)
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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