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 138 of 524
TB 9-2320-279-13-1
0012-52
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.
Fan control switch OK.
Wire 1156 OK.
POSSIBLE PROBLEMS
AC harness wire 1156 faulty.
AC temperature control switch faulty.
26.
Is continuity measured
across temperature control
switch when switch is set to
the coldest position?
Replace temperature
control switch
(WP 0044).
Verify
repair, go to Step 27
of this fault.
NO
YES
Read WARNING on
page 0012-53.
WARNING
Repair AC wire 1156 (see
Appendix A) or replace AC
wiring harness (WP 0046).
Verify repair, go to Step 27 of
this fault.
TEST OPTIONS
Continuity test.
Multimeter.
REASON FOR QUESTION
If continuity is measured, AC
harness wire 1156 is
faulty.
If not, temperature
control switch is faulty.
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