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 78 of 524
TB 9-2320-279-13-1
0011-10
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
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.
AC heater/evaporator blower resistor OK.
POSSIBLE PROBLEMS
Fan control switch harness red wire faulty.
Fan control switch faulty.
8.
Is continuity measured
across fan control switch
harness red wire?
Repair fan control
switch harness red
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 0011-11.
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 red 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
red wire OK.
Fan control switch harness red wire OK.
POSSIBLE PROBLEMS
AC heater/evaporator blower resistor harness
brown wire faulty.
Fan control switch harness brown wire faulty.
AC heater/evaporator blower resistor faulty.
Fan control switch faulty.
9.
Are 22 to 28 vdc measured on
brown wire at fan control
switch harness connector,
terminal 2, when fan control
switch is in the medium
speed position?
Go to Step 11 of this
fault.
NO
YES
Read WARNING on
page 0011-11.
WARNING
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TEST OPTIONS
Voltage test.
Multimeter.
REASON FOR QUESTION
If 22 to 28 vdc are not
measured, AC heater/
evaporator blower will not
operate at medium speed.
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