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Page Title:
AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE IN ALL SPEEDS (LOW, MEDIUM, AND HIGH) - continued |
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 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
12.
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
orange wire at fan control
REASON FOR QUESTION
least one speed.
switch harness connector,
AC heater/evaporator blower resistor harness
If 22 to 28 vdc is not
terminal 3, when fan control
brown wire OK.
measured, AC heater/
switch is in the high speed
Fan control switch harness brown wire OK.
evaporator blower will not
position?
operate at high speed.
AC heater/evaporator blower resistor harness
red wire OK.
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Fan control switch harness red wire OK.
POSSIBLE PROBLEMS
AC heater/evaporator blower resistor harness
orange wire faulty.
Go to Step 14 of this
NO
fault.
Fan control switch harness orange wire faulty.
AC heater/evaporator blower resistor faulty.
YES
Fan control switch faulty.
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WARNING
13.
KNOWN INFO
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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
REASON FOR QUESTION
least one speed.
blower motor resistor
AC heater/evaporator blower resistor harness
If continuity is measured, AC
harness orange wire?
brown wire OK.
heater/evaporator blower
Fan control switch harness brown wire OK.
motor resistor is faulty. If
not, AC heater/evaporator
AC heater/evaporator blower resistor harness
blower motor resistor
red wire OK.
harness orange wire is
Fan control switch harness red wire OK.
faulty.
Repair AC heater/
Fan control switch harness orange wire OK.
evaporator blower
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Fan control switch OK.
motor resistor harness
NO
orange wire (see
POSSIBLE PROBLEMS
Appendix A) or replace
AC heater/evaporator
AC heater/evaporator blower resistor harness
YES
blower motor resistor
orange 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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0011-14
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