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 126 of 524
TB 9-2320-279-13-1
0012-40
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 harness wire 1156 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.
AC condenser motor solenoid OK.
AC condenser motor power wire OK.
AC condenser motor ground wire OK.
AC condenser motor OK.
POSSIBLE PROBLEMS
AC condenser assembly harness black wire
faulty.
AC harness wire 1155 faulty.
20.
Are 22 to 28 vdc measured on
AC harness wire 1155 at AC
condenser assembly
connector?
Repair AC harness
wire 1155 (see
Appendix A) or
replace AC wiring
harness (WP 0046).
Verify repair, go to
Step 27 of this fault.
NO
YES
Read WARNING on
page 0012-41.
WARNING
Repair AC condenser
assembly harness black wire
(see Appendix A).
Verify
repair, go to Step 27 of this
fault.
TEST OPTIONS
Voltage test.
Multimeter.
REASON FOR QUESTION
If 22 to 28 vdc are measured,
AC condenser assembly
harness black wire is
faulty.
If not, AC harness
wire 1155 is faulty.
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