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 84 of 524
TB 9-2320-279-13-1
0011-16
AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE IN ALL SPEEDS
(LOW, MEDIUM, AND HIGH) - Continued
DRAFT
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KNOWN INFO
Fan control switch, fan control switch
harness, and AC heater/evaporator blower
resistor harness connections OK.
AC heater/evaporator blower operates in at
least one speed.
AC heater/evaporator blower resistor harness
brown wire OK.
Fan control switch harness brown wire OK.
AC heater/evaporator blower resistor harness
red wire OK.
Fan control switch harness red wire OK.
AC heater/evaporator blower resistor harness
orange wire OK.
AC heater/evaporator blower resistor OK.
POSSIBLE PROBLEMS
Fan control switch harness orange wire faulty.
Fan control switch faulty.
14.
Is continuity measured
across fan control switch
harness orange wire?
Repair fan control
switch harness orange
wire (see Appendix A)
or replace fan control
switch harness
(WP 0031).
Verify
repair, go to Step 15 of
this fault.
NO
YES
Read WARNING on
page 0011-17.
WARNING
Replace fan control switch
(WP 0031).
Verify repair, go to
Step 15 of this fault.
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TEST OPTIONS
Continuity test.
Multimeter.
REASON FOR QUESTION
If continuity is measured, fan
control switch is faulty.
If
not, fan control switch
harness orange wire is
faulty.
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KNOWN INFO
Fan control switch, fan control switch
harness, and AC heater/evaporator blower
resistor harness connections OK.
AC heater/evaporator blower operates in at
least one speed.
AC heater/evaporator blower resistor harness
orange wire OK.
Fan control switch harness orange wire OK.
AC heater/evaporator blower resistor harness
brown wire OK.
Fan control switch harness brown wire OK.
AC heater/evaporator blower resistor harness
red wire OK.
Fan control switch harness red wire OK.
AC heater/evaporator blower resistor OK.
Fan control switch OK.
POSSIBLE PROBLEMS
None
15.
Does AC heater/evaporator
blower operate at low,
medium, and high speeds?
Fault not corrected,
notify Supervisor.
NO
YES
Read WARNING on
page 0011-17.
WARNING
Fault corrected.
TEST OPTIONS
Verify repair.
REASON FOR QUESTION
If AC heater/evaporator
blower operates at low,
medium, and high speeds,
fault has been corrected.
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