TM 5-3805-262-203-24. ACCESSORIES TROUBLESHOOTING (CONT)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION7. COLD AIR BLOWN FROM CAB HEATER (Cont) .S t e p 2 . ( C o n t ).a. If heater turnoff valves are closed, open.b. If heater turnoff valves are open, go to step 3 below.Step 3.Check if area around console is obstructed, preventing flow of airthrough and around heater core.a . I fb . I fStep 4. Removea .b .8. DEFROSTER MOTORI fI fobstructions seen, remove.obstructions are not seen,and test engine thermostatengine thermostat does notgo to step 4 below.(page 4-87).test okay, replace (page 4-87).engine thermostat tests okay, remove and replace HEAT CONTROLlocated on cab switch panel (page 10-46).DOES NOT OPERATE.Step 1. Turn ignition key switch to on position.Pull HEATER FAN switch on cab switch panel out.Check if heater fan is on.a. If heater fan is not on, go to step 2 below.b. If heater fan is on, go to step 5 below.Step 2.Press 5 ampere circuit breaker located on right instrument p a n e l.3-169
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