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 188 of 524
TB 9-2320-279-13-1
0015-20
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.
AC system charge is not low.
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.
AC condenser core OK.
POSSIBLE PROBLEMS
Moisture in AC refrigerant system.
AC expansion valve faulty.
AC system overcharged.
13.
Are AC evaporator core and
system low-side AC hose at
AC evaporator core free from
excessive sweating and
frost?
NO
YES
Read WARNING on
page 0015-21.
WARNING
TEST OPTIONS
Visual inspection.
REASON FOR QUESTION
If AC evaporator core and
system low-side AC hose
at AC evaporator core are
free from excessive
sweating and frost, AC
system may be
overcharged.
If not, AC
expansion valve is faulty
or moisture may have
entered system.
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.
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.
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