DRAFT
TB 9-2320-364-13&P-1
AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE - Continued
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WARNING
6.
KNOWN INFO
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Read WARNING on
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CTIS operates indicating 24 vdc power OK.
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TEST OPTIONS
AC circuit breaker OK.
Wire 1280A OK.
Is continuity measured
Wire 1082 OK.
across AC heater/evaporator
Fan control switch OK.
blower motor ground wire
REASON FOR QUESTION
Fan control switch harness connector OK.
from blower motor case to
If continuity is measured, AC
AC heater/evaporator blower motor resistor
ground?
heater/evaporator blower
harness connector OK.
motor is faulty. If not, AC
AC heater/evaporator blower motor power
heater/evaporator blower
wire OK.
motor ground wire is
faulty.
POSSIBLE PROBLEMS
Repair AC heater/
evaporator blower
AC heater/evaporator blower motor faulty.
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motor ground wire
(see Appendix A) or
AC heater/evaporator blower motor ground
NO
replace AC heater/
wire faulty.
evaporator blower
motor (WP 0034).
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YES
Verify repair, go to
Step 8 of this fault.
Replace AC heater/
evaporator blower motor
assembly (WP 0034). Verify
repair, go to Step 8 of this
fault.
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WARNING
7.
KNOWN INFO
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Read WARNING on
TEST OPTIONS
CTIS operates indicating 24 vdc power OK.
Voltage test.
Wire 1082 OK.
Fan control switch OK.
Are 22 to 28 vdc measured on
Fan control switch harness connector OK.
REASON FOR QUESTION
wire 1280A at AC circuit
AC heater/evaporator blower motor resistor
If 22 to 28 vdc are measured,
breaker, when engine start
harness connector OK.
AC circuit breaker is faulty.
switch is in the ON position?
AC heater/evaporator blower motor power
If not, wire 1280A harness
wire OK.
is faulty.
AC heater/evaporator blower motor OK.
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AC heater/evaporator blower motor ground
wire OK.
Repair wire 1280A
POSSIBLE PROBLEMS
(see Appendix A) or
NO
replace wire 1280A
AC circuit breaker faulty.
harness (WP 0047).
Verify repair, go to
Wire 1280A faulty.
Step 8 of this fault.
YES
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Replace AC 20 AMP circuit
breaker (WP 0018). Verify
repair, go to Step 8 of this
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0010-8
