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 74 of 524
TB 9-2320-279-13-1
0011-6
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.
POSSIBLE PROBLEMS
AC heater/evaporator blower resistor harness
orange wire faulty.
Fan control switch harness orange wire faulty.
AC heater/evaporator blower resistor harness
brown wire faulty.
Fan control switch harness brown wire faulty.
AC heater/evaporator blower resistor harness
red wire faulty.
Fan control switch harness red wire faulty.
AC heater/evaporator blower resistor faulty.
Fan control switch faulty.
4.
Does AC heater/evaporator
blower motor operate when
fan control switch is in the
high speed position?
Go to Step 12 of this
fault.
NO
YES
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TEST OPTIONS
Visual inspection.
REASON FOR QUESTION
If AC heater/evaporator
blower operates at high
speed,
high speed blower
circuit is OK.
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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.
POSSIBLE PROBLEMS
AC heater/evaporator blower resistor harness
brown wire faulty.
Fan control switch harness brown wire faulty.
AC heater/evaporator blower resistor harness
red wire faulty.
Fan control switch harness red wire faulty.
AC heater/evaporator blower resistor faulty.
Fan control switch faulty.
5.
Does AC heater/evaporator
blower motor operate when
fan control switch is in the
medium speed position?
Go to Step 9 of this
fault.
NO
YES
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TEST OPTIONS
Visual inspection.
REASON FOR QUESTION
If AC heater/evaporator
blower operates at
medium speed, medium
speed blower circuit is OK.
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