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TM
5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
37. CAB HEATER FAN WILL NOT OPERATE.
NOTE
Vehicle MASTER disconnect switch must be ON and ignition switch set to ON.
Failure to do so will cause erroneous results.
Refer to wiring diagram for all wiring repair steps.
Step 1. Remove clamp (1) and pipe (2).
Step 2. Disconnect connector AE (3) and check for +24 VDC between wire 61 (4)
and ground.
If +24 VDC is present, replace cab heater (page 4-490).
If +24 VDC is not present, repair wiring 61 between cab heater
and fuse box 1.

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