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TM 9-2320-364-20-3
2-2922
6. FAN SPEED DOES NOT LOWER FROM HIGH SPEED TO LOW SPEED (CONT).
Heater blower motor operates,
indicating CB15 OK.
Fan operates at low speed with
hydraulic selector switch in
AUTO or CRANE/SRW
position.
Fan operates at low speed with
throttle position switch
depressed.
Wire 1933 between MC59 and
MC128 OK.
Wire 1932 between MC59 and
MC61 OK.
Wire 1932 between MC61 and
MC128 OK.
Temperature sensor OK.
Wire 1538 OK.
Wire 1435 from fan
controller OK.
Wires 1935 and 1936 between
MC59 and MC76 OK.
Temperature switch faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Continuity test.
STE/ICE-R #91.
If temperature switch is stuck
open, fan will operate at high
speed.
YES
NO
Replace temperature
switch (Para 7-80).
Verify repair, go to
Step 19 of this Fault.
10.
Is continuity measured
between temperature switch
connector MC128, terminals A
and B with engine cool?
Fault not corrected.
Notify DS
Maintenance.
WARNING
Read WARNING
on Page 2-2923
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