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Page Title:
AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE IN ALL SPEEDS (LOW, MEDIUM, AND HIGH) (Cont) |
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 DRAFT
TB 9-2320-279-13-1
AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE IN ALL SPEEDS
(LOW, MEDIUM, AND HIGH) - Continued
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WARNING
6.
KNOWN INFO
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Read WARNING on
Fan control switch, fan control switch
harness, and AC heater/evaporator blower
TEST OPTIONS
resistor harness connections OK.
Are 22 to 28 vdc measured on
AC heater/evaporator blower operates in at
Voltage test.
red wire at fan control switch
least one speed.
harness connector,
AC heater/evaporator blower resistor harness
terminal 1, when fan control
REASON FOR QUESTION
orange wire OK.
switch is in the low speed
Fan control switch harness orange wire OK.
If 22 to 28 vdc are not
position?
measured, AC heater/
AC heater/evaporator blower resistor harness
evaporator blower will not
brown wire OK.
operate at low speed.
Fan control switch harness brown wire OK.
POSSIBLE PROBLEMS
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AC heater/evaporator blower resistor harness
Go to Step 8 of this
red wire faulty.
NO
fault.
Fan control switch harness red wire faulty.
AC heater/evaporator blower resistor faulty.
YES
Fan control switch faulty.
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WARNING
7.
KNOWN INFO
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Read WARNING on
TEST OPTIONS
Fan control switch, fan control switch
harness, and AC heater/evaporator blower
Continuity test.
resistor harness connections OK.
Is continuity measured
AC heater/evaporator blower operates in at
across AC heater/evaporator
least one speed.
REASON FOR QUESTION
blower motor resistor
AC heater/evaporator blower resistor harness
If continuity is measured, AC
harness red wire?
orange wire OK.
heater/evaporator blower
Fan control switch harness orange wire OK.
motor resistor is faulty. If
not, AC heater/evaporator
AC heater/evaporator blower resistor harness
blower motor resistor
brown wire OK.
harness red wire is faulty.
Fan control switch harness brown wire OK.
Repair AC heater/
Fan control switch harness red wire OK.
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evaporator blower
Fan control switch OK.
NO
motor resistor harness
red wire (see
POSSIBLE PROBLEMS
Appendix A) or replace
AC heater/evaporator
AC heater/evaporator blower resistor harness
YES
blower motor resistor
red wire faulty.
harness (WP 0036).
AC heater/evaporator blower resistor faulty.
Verify repair, go to
Step 15 of this fault.
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Replace AC heater/
evaporator blower motor
resistor (WP 0035). Verify
repair, go to Step 15 of this
fault.
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0011-8
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