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 80 of 524
TB 9-2320-279-13-1
0011-12
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
red wire OK.
Fan control switch harness red wire OK.
Fan control switch harness brown wire OK.
Fan control switch OK.
POSSIBLE PROBLEMS
AC heater/evaporator blower resistor harness
brown wire faulty.
AC heater/evaporator blower resistor faulty.
10.
Is continuity measured
across AC heater/evaporator
blower motor resistor
harness brown wire?
NO
YES
Read WARNING on
page 0011-13.
WARNING
Repair AC heater/
evaporator blower
motor resistor harness
brown wire (see
Appendix A) or replace
AC heater/evaporator
blower motor resistor
harness (WP 0036).
Verify repair, go to
Step 15 of this fault.
Replace AC heater/
evaporator blower motor
resistor (WP 0035).
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, AC
heater/evaporator blower
motor resistor is faulty.
If
not, AC heater/evaporator
blower motor resistor
harness brown 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.
Fan control switch harness red wire OK.
AC heater/evaporator blower resistor harness
red wire OK.
AC heater/evaporator blower resistor harness
brown wire OK.
AC heater/evaporator blower resistor OK.
POSSIBLE PROBLEMS
Fan control switch harness brown wire faulty.
Fan control switch faulty.
11.
Is continuity measured
across fan control switch
harness brown wire?
Repair fan control
switch harness brown
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 0011-13.
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 brown wire is
faulty.
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