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 72 of 524
TB 9-2320-279-13-1
0011-4
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.
POSSIBLE PROBLEMS
AC heater/evaporator blower does not
operate in all speeds.
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.
2.
Does AC heater/evaporator
blower motor operate in low,
medium, and high fan control
switch positions after
reseating loose connections?
Go to Step 3 of this
fault.
NO
YES
Go to Step 15 of this fault.
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TEST OPTIONS
Visual inspection.
REASON FOR QUESTION
If AC heater/evaporator
blower operates in all
blower speed switch
positions, problem has
been corrected.
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KNOWN INFO
Fan control switch, fan control switch
harness, and AC heater/evaporator blower
resistor harness connections OK.
POSSIBLE PROBLEMS
AC heater/evaporator blower does not
operate in all speeds.
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.
3.
Does AC heater/evaporator
blower motor operate in at
least one fan control switch
position (low, medium or
high)?
Go to work package
0010 (AC Heater/
Evaporator Blower
Does Not Operate).
NO
YES
TEST OPTIONS
Visual inspection.
REASON FOR QUESTION
If AC blower operates in at
least one speed, power to
fan control switch and AC
heater/evaporator blower
motor circuit is OK.
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