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Page Title:
AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE IN ALL SPEEDS (LOW, MEDIUM, AND HIGH) |
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 DRAFT
TB 9-2320-364-13&P-1
AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE IN ALL SPEEDS
(LOW, MEDIUM, AND HIGH)
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INITIAL SETUP:
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Maintenance Level
Materials/Parts
Field Level Maintenance
None
Equipment Condition
Personnel Required
Shut off engine (TM 9-2320-364-10).
One
Parking brake applied (TM 9-2320-364-10).
References
Wheels chocked (TM 9-2320-364-10).
TM 9-2320-364-10
Tools and Special Tools
TM 9-2320-364-20
Tool Kit, General Mechanic's (Item 9, Appendix F)
Multimeter (Item 2, Appendix F)
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START
WARNING
1.
KNOWN INFO
TEST OPTIONS
Read WARNING on
None
Visual inspection.
POSSIBLE PROBLEMS
REASON FOR QUESTION
Are fan control switch, fan
Fan control switch, fan control switch
If fan control switch, fan
control switch harness, and
harness, or AC heater/evaporator blower
control switch harness,
AC heater/evaporator blower
resistor harness connections loose.
and AC heater/evaporator
motor resistor harness
blower motor resistor
AC heater/evaporator blower does not
harness connectors are
connections tight?
operate in all speeds.
not seated correctly, AC
AC heater/evaporator blower resistor harness
heater/evaporator blower
orange wire faulty.
may not operate at all
Fan control switch harness orange wire faulty.
switch positions.
AC heater/evaporator blower resistor harness
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brown wire faulty.
Reseat loose
NO
connections and go
Fan control switch harness brown wire faulty.
to Step 2 of this fault.
AC heater/evaporator blower resistor harness
red wire faulty.
YES
Fan control switch harness red wire faulty.
AC heater/evaporator blower resistor faulty.
Fan control switch faulty.
Go to Step 3 of this fault.
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