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TM 9-2320-364-20-2
2-1588
49. HEATER DOES NOT OPERATE OR WILL NOT CHANGE SPEEDS (CONT).
2.
Replace FAN control
switch (Para 19-17).
Verify repair, go to
Step 10 of this Fault.
YES
NO
Cooling fan operation normal
indicating 24 vdc supplied to
EPAC from CB15.
Fan and heater operates at one
speed.
FAN control switch faulty.
Heater wire harness faulty.
Heater resistor faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Continuity test.
STE/ICE-R #91.
If continuity is not measured,
FAN control switch is faulty.
WARNING
Is there continuity measured
across FAN control switch
terminals?
Read WARNING
on Page 2-1589
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