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 70 of 524
TB 9-2320-279-13-1
(0011-1 blank)/0011-2
0011
AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE IN ALL SPEEDS
(LOW, MEDIUM, AND HIGH)
DRAFT
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INITIAL SETUP:
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Maintenance Level
Field Level Maintenance
Equipment Condition
Shut off engine (TM 9-2320-279-10).
Parking brake applied (TM 9-2320-279-10).
Wheels chocked (TM 9-2320-279-10).
Tools and Special Tools
Tool Kit, General Mechanic’s (Item 7, Appendix F)
Multimeter (Item 2, Appendix F)
Materials/Parts
None
Personnel Required
MOS 52C, Utilities equipment repairer
References
TM 9-2320-279-10
TM 9-2320-279-20
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KNOWN INFO
None
POSSIBLE PROBLEMS
Fan control switch, fan control switch
harness, or AC heater/evaporator blower
resistor harness connections loose.
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.
1.
Are fan control switch, fan
control switch harness, and
AC heater/evaporator blower
motor resistor harness
connections tight?
Reseat loose
connections and go
to Step 2 of this fault.
NO
YES
Read WARNING on
page 0011-3.
WARNING
START
Go to Step 3 of this fault.
TEST OPTIONS
Visual inspection.
REASON FOR QUESTION
If fan control switch, fan
control switch harness,
and AC heater/evaporator
blower motor resistor
harness connectors are
not seated correctly, AC
heater/evaporator blower
may not operate at all
switch positions.
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