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 TM 10-3930-673-20-1
2
31. CAB BLOWER DOES NOT OPERATE.
INITIAL SETUP
Personnel Required
Tools and Special Tools
Two
Tool Kit, General Mechanics: Automotive
(Item 18, Appendix F)
References
STE/ICE-R (Item 17, Appendix F)
TM 10-3930-673-10
Multimeter, Digital (Item 9, Appendix F)
TM 9-4910-571-12&P
Equipment Condition
Engine shut down (TM 10-3930-673-10)
Parking brake on (TM 10-3930-673-10)
Wheels chocked (TM 10-3930-673-10)
START
1
KNOWN INFO
TEST OPTIONS
Heater/air conditioner switch OK.
Visual inspection.
Is green light illuminated on
Defrost fans OK.
STE/ICE-R #89.
cab blower switch?
POSSIBLE PROBLEMS
REASON FOR QUESTION
Jumper wires faulty.
This question eliminates possible
Cab blower switch faulty.
problems and determines where
Fan speed wires faulty.
troubleshooting continues.
Fan resistor pack faulty.
Fan motor faulty.
Go to Step 2 of this
NO
fault.
YES
Go to Step 3 of this
fault.
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