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TM 9-2320-364-20-2
2-1594
49. HEATER DOES NOT OPERATE OR WILL NOT CHANGE SPEEDS (CONT).
7.
Repair or replace wire
1082 (see schematic
Fig 2-42).
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 OK.
Heater wire harness OK.
Heater resistor OK.
Wire 1082 OK.
Rectifier M81 OK.
Wire 1082 faulty.
Orange wire faulty.
Heater ground faulty.
Heater motor faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
If 22 to 28 vdc are not measured
on wire 1082 at FAN control
switch, wire is faulty.
WARNING
Are 22 to 28 vdc present on
wire 1082 at FAN control
switch?
Read WARNING
on Page 2-1595
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