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 176 of 524
TB 9-2320-279-13-1
0015-8
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.
POSSIBLE PROBLEMS
Restricted AC hose.
AC compressor faulty.
Temperature control switch faulty.
Moisture in AC refrigerant system.
Air or other contaminant in AC refrigerant
system.
AC condenser core faulty.
AC expansion valve faulty.
AC system overcharged.
AC condenser dryer faulty.
AC evaporator core faulty.
AC system charge low.
AC system leaking.
4.
Does AC condenser dryer
sight glass indicate system is
fully charged?
Perform leak test
(WP 0049).
If leaks
are found, recover
R-134a refrigerant
(WP 0050), repair
leaks, and replace
AC dryer (WP 0025).
Charge system to full
charge (WP 0050)
and go to Step 5 of
this fault.
NO
YES
Read WARNING on
page 0015-9.
WARNING
TEST OPTIONS
Visual inspection.
REASON FOR QUESTION
If system is not fully charged,
system may not cool
properly.
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