DRAFT
TB 9-2320-364-13&P-1
AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE IN ALL SPEEDS
(LOW, MEDIUM, AND HIGH) - Continued
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WARNING
8.
KNOWN INFO
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Read WARNING on
TEST OPTIONS
Fan control switch, fan control switch
harness, and AC heater/evaporator blower
resistor harness connections OK.
AC heater/evaporator blower operates in at
Is continuity measured
least one speed.
REASON FOR QUESTION
across fan control switch
AC heater/evaporator blower resistor harness
If continuity is measured, fan
harness red wire?
orange wire OK.
control switch is faulty. If
Fan control switch harness orange wire OK.
not, fan control switch
harness red wire is faulty.
AC heater/evaporator blower resistor harness
brown wire OK.
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Fan control switch harness brown wire OK.
AC heater/evaporator blower resistor harness
Repair fan control
red wire OK.
switch harness red
wire (see Appendix A)
AC heater/evaporator blower resistor OK.
or replace fan control
NO
POSSIBLE PROBLEMS
switch harness
(WP 0031). Verify
Fan control switch harness red wire faulty.
repair, go to Step 15 of
YES
Fan control switch faulty.
this fault.
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Replace fan control switch
(WP 0031). Verify repair, go
to Step 15 of this fault.
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WARNING
9.
KNOWN INFO
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Read WARNING on
TEST OPTIONS
Fan control switch, fan control switch
harness, and AC heater/evaporator blower
Voltage test.
resistor harness connections OK.
Are 22 to 28 vdc measured on
AC heater/evaporator blower operates in at
brown wire at fan control
least one speed.
REASON FOR QUESTION
switch harness connector,
AC heater/evaporator blower resistor harness
If 22 to 28 vdc are not
terminal 2, when fan control
orange wire OK.
measured, AC heater/
switch is in the medium
Fan control switch harness orange wire OK.
evaporator blower will not
speed position?
operate at medium speed.
AC heater/evaporator blower resistor harness
red wire OK.
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Fan control switch harness red wire OK.
POSSIBLE PROBLEMS
Go to Step 11 of this
NO
AC heater/evaporator blower resistor harness
fault.
brown wire faulty.
Fan control switch harness brown wire faulty.
YES
AC heater/evaporator blower resistor faulty.
Fan control switch faulty.
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0011-10
