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 106 of 524
TB 9-2320-279-13-1
0012-20
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 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.
AC heater/evaporator core not blocked or
damaged.
AC temperature control switch temperature
probe OK.
Heater cable OK.
AC cable OK.
Defrost cable OK.
POSSIBLE PROBLEMS
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.
10.
Are 22 to 28 vdc measured on
AC harness wire 1154 at AC
compressor clutch connector,
when fan control switch is set
to an on position and
temperature control switch is
set to the coldest temperature
position?
Connect AC harness
wire 1154 connector
to AC compressor
clutch connector, and
go to Step 11 of this
fault.
NO
YES
Read WARNING on
page 0012-21.
WARNING
Recover R-134a refrigerant
(WP 0050).
Replace AC
compressor (WP 0023) and
AC condenser dryer
(WP 0025).
Evacuate and
charge system (WP 0050).
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 compressor clutch is
faulty.
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