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 62 of 524
TB 9-2320-279-13-1
0010-6
AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE - Continued
DRAFT
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KNOWN INFO
Circuit breaker No. 11 OK.
Engine start switch OK.
Wire 1640 OK.
Wire 1082 OK.
Fan control switch OK.
POSSIBLE PROBLEMS
Fan control switch harness connector loose
or faulty.
AC heater/evaporator blower motor resistor
harness connector loose or faulty.
AC heater/evaporator blower motor power
wire faulty.
AC heater/evaporator blower motor faulty.
AC heater/evaporator blower motor ground
wire faulty.
4.
Are fan control switch and AC
heater/evaporator blower
motor resistor harness wires
free from damage and loose
connectors?
Repair wires (see
Appendix A) or
replace fan control
switch harness
(WP 0031) or AC
heater/evaporator
blower motor resistor
harness (WP 0036)
as required.
Verify
repair, go to Step 9 of
this fault.
NO
YES
Read WARNING on
page 0010-7.
WARNING
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TEST OPTIONS
Visual inspection.
REASON FOR QUESTION
If connectors are loose or
wires are damaged, AC
heater/evaporator blower
will not operate.
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KNOWN INFO
Circuit breaker No. 11 OK.
Engine start switch OK.
Wire 1640 OK.
Wire 1082 OK.
Fan control switch OK.
Fan control switch harness connector OK.
AC heater/evaporator blower motor resistor
harness connector OK.
POSSIBLE PROBLEMS
AC heater/evaporator blower motor power
wire faulty.
AC heater/evaporator blower motor faulty.
AC heater/evaporator blower motor ground
wire faulty.
5.
Is continuity measured
across AC heater/evaporator
blower power wire from AC
heater/evaporator blower
motor resistor to blower
motor power wire splice?
Repair AC heater/
evaporator blower
motor power wire (see
Appendix A) or replace
AC heater/evaporator
blower motor resistor
harness (WP 0036).
Verify repair, go to
Step 9 of this fault.
NO
YES
Read WARNING on
page 0010-7.
WARNING
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TEST OPTIONS
Continuity test.
Multimeter.
REASON FOR QUESTION
If continuity is not measured,
AC heater/evaporator
blower power wire is
faulty.
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