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 134 of 524
TB 9-2320-279-13-1
0012-48
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.
Heater cable OK.
AC cable OK.
Defrost cable OK.
AC compressor clutch OK.
AC harness wire 1154 OK.
Low pressure switch OK.
AC harness wire 1158 OK.
High pressure switch 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 OK.
AC condenser motor solenoid ground wire
OK.
POSSIBLE PROBLEMS
Fan control switch faulty.
Wire 1156 faulty.
AC harness wire 1156 faulty.
AC temperature control switch faulty.
24.
Are 22 to 28 vdc measured on
fan control switch, terminal C
(wire 1156), when fan control
switch is set to an on
position?
Replace fan control
switch (WP 0031).
Verify repair, go to
Step 27 of this fault.
NO
YES
Read WARNING on
page 0012-49.
WARNING
TEST OPTIONS
Voltage test.
Multimeter.
REASON FOR QUESTION
If 22 to 28 vdc are not
measured, fan control
switch is faulty.
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