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TM 9-4120-389-14
Table 4-2. UNIT TROUBLESHOOTING-(cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
9.
EVAPORATOR FAN MOTOR (B3) DOES NOT OPERATE.
WARNING
Disconnect input power before performing internal electrical troubleshooting.
Voltages used can be deadly.
Tighten or replace loose or damaged connectors, or repair damaged wires.
Step 1.
Using wiring diagram (FO-1), check individual wires for tightness and continuity.
Tighten, repair, or replace as indicated.
Step 2.
Check operation of fan motor relay (K6).
Test relay (See para. 4-49). Replace relay if defective.
Step 3.
Check operation of fan motor (B3).
Test motor (See para. 4-34). Repair or replace as needed.
Step 4.
Check operation of mode selector switch (S1).
Test switch (See para. 4-41).
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