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Page Title:
CAB BLOWER DOES NOT OPERATE - continued |
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 TM 10-3930-673-20-1
31. CAB BLOWER DOES NOT OPERATE (CONT).
3
KNOWN INFO
TEST OPTIONS
Heater/air conditioner switch OK.
Voltage test.
Is voltage present at fan
Defrost fans OK.
STE/ICE-R #89.
switch where high (orange
Jumper wires OK.
REASON FOR QUESTION
wire), medium (light blue
POSSIBLE PROBLEMS
If voltage is not present, fan switch
wire), and low (yellow wire)
Cab blower switch faulty.
is faulty.
connects?
Fan speed wires faulty.
Fan resistor pack faulty.
Fan motor faulty.
Replace fan switch
NO
(Para 17-9).
YES
KNOWN INFO
TEST OPTIONS
4
Heater/air conditioner switch OK.
Voltage test.
Is voltage present at fan
Defrost fans OK.
STE/ICE-R #89.
Jumper wires OK.
resistor pack where high
REASON FOR QUESTION
Cab blower switch OK.
(orange wire), medium (light
If voltage is not present, fan speed
POSSIBLE PROBLEMS
blue wire), and low (yellow
wire is faulty.
wire) connects?
Fan speed wires faulty.
Fan resistor pack faulty.
Fan motor faulty.
Repair faulty fan
NO
speed wire
(Para 8-48).
YES
2-464
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