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