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 198 of 524
TB 9-2320-279-13-1
0015-30
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.
No restricted AC hoses.
AC compressor OK.
Temperature control switch OK.
No air or other contaminant in AC refrigerant
system.
AC condenser core OK.
AC expansion valve OK.
AC system not overcharged.
AC condenser dryer OK.
AC evaporator core OK.
POSSIBLE PROBLEMS
AC low pressure switch faulty.
AC system charge low.
AC system leaking.
21.
Does AC test set recovery/
recycling manifold system
low-side gage indicate a
pressure of at least 30 psi?
NO
YES
Read WARNING on
page 0015-31.
WARNING
TEST OPTIONS
Pressure test.
AC test set manifold gage.
REASON FOR QUESTION
If at least 30 psi pressure is
measured, AC low
pressure switch is faulty.
If not, AC system charge
is low.
Check system for
loose fittings and
damage.
Tighten
loose fittings and
repair damage.
Perform leak test
(WP 0049).
Repair
any leaks found and
replace AC dryer
(WP 0025).
Evacuate
and charge system
with new R-134a
refrigerant (WP 0050).
Verify repair, go to
Step 22 of this fault.
Replace AC low pressure
switch (WP 0041).
Verify
repair, go to Step 22 of this
fault.
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