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 98 of 524
TB 9-2320-279-13-1
0012-12
AC HEATER/EVAPORATOR BLOWER OPERATES BUT NO COLD AIR FROM
DUCTS DURING AC OPERATIONS - Continued
DRAFT
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KNOWN INFO
Power to fan control switch OK.
Blower operates.
AC condenser core not blocked or damaged.
AC compressor belts OK.
AC heater/evaporator core not blocked or
damaged.
AC temperature control switch temperature
probe OK.
AC condenser motor solenoid OK.
AC condenser motor power wire OK.
AC condenser motor ground wire OK.
AC condenser motor OK.
AC condenser assembly harness black wire
OK.
AC harness wire 1155 OK.
AC condenser assembly harness green wire
OK.
AC condenser motor solenoid ground wire
OK.
Fan control switch OK.
Wire 1156 OK.
AC temperature control switch OK.
POSSIBLE PROBLEMS
Heater cable faulty.
AC cable faulty.
Defrost cable faulty.
AC compressor clutch faulty.
AC harness wire 1154 faulty.
Low pressure switch faulty.
AC harness wire 1156 faulty.
AC harness wire 1158 faulty.
High pressure switch faulty.
6.
Does AC compressor clutch
engage when engine start
switch is turned on, when fan
control switch is set to an on
position and temperature
control switch is set to the
coldest temperature position?
Go to Step 10 of this
fault.
NO
YES
TEST OPTIONS
Audible test.
REASON FOR QUESTION
If AC compressor clutch does
not engage, AC
compressor will not
operate.
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