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 64 of 524
TB 9-2320-279-13-1
0010-8
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.
Fan control switch harness connector OK.
AC heater/evaporator blower motor resistor
harness connector OK.
AC heater/evaporator blower motor power
wire OK.
POSSIBLE PROBLEMS
AC heater/evaporator blower motor faulty.
AC heater/evaporator blower motor ground
wire faulty.
6.
Is continuity measured
across AC heater/evaporator
blower motor ground wire
from blower motor case to
ground?
Repair AC heater/
evaporator blower
motor ground wire
(see Appendix A) or
replace AC heater/
evaporator blower
motor (WP 0034).
Verify repair, go to
Step 9 of this fault.
NO
YES
Read WARNING on
page 0010-9.
WARNING
Replace AC heater/
evaporator blower motor
assembly (WP 0034).
Verify
repair, go to Step 9 of this
fault.
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TEST OPTIONS
Continuity test.
Multimeter.
REASON FOR QUESTION
If continuity is measured, AC
heater/evaporator blower
motor is faulty.
If not, AC
heater/evaporator blower
motor ground wire is
faulty.
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KNOWN INFO
Wire 1082 OK.
Fan control switch OK.
Fan control switch harness connector OK.
AC heater/evaporator blower motor resistor
harness connector OK.
AC heater/evaporator blower motor power
wire OK.
AC heater/evaporator blower motor OK.
AC heater/evaporator blower motor ground
wire OK.
POSSIBLE PROBLEMS
Circuit breaker No. 11 faulty.
Engine start switch faulty.
Wire 1640 faulty.
7.
Are 22 to 28 vdc measured on
wire 1640 at circuit breaker
No. 11, when engine start
switch is in the ON position?
Go to Step 8 of this
fault.
NO
YES
Read WARNING on
page 0010-9.
WARNING
Replace circuit breaker No. 11
(WP 0017).
Verify repair, go to
Step 9 of this fault.
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TEST OPTIONS
Voltage test.
Multimeter.
REASON FOR QUESTION
If 22 to 28 vdc are measured,
circuit breaker No. 11 is
faulty.
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