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TM 5-4210-233-14&P-1
Table 4-2. Unit Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
CAB
1
CAB HEATER FAILS TO HEAT
Step
1.
Heater valve closed.
a.
Open heater valve.
b.
Replace heater valve or heater valve operating cable (see para 4-103).
Step
2.
Engine not at working temperature.
a.
Wait until engine at temperature.
b.
Engine thermostat failed, replace thermostat (seepara 4-136).
Step
3.
Core or fan blocked by dirt or litter.
Clean fan housing or heater.
Step
4.
Coolant lines blocked.
Replace damaged hose (see para 4-103 and 4-104).
Step
5.
Air lock in heater.
Loosen outlet connection and vent air.
Step
6.
Blower fan not working.
a.
Replace defective switch, wire or circuit breaker (see para 4-9).
b.
Replace fan motor, or tighten fan blower to motor shaft (see para 4-104).
2
CAB DEFROSTER LOUVERS NOT BLOWING
Step
1.
Defroster damper not opening.
Check cable and damper.
Step
2.
Blower motor not operating.
a.
Check blower motor.
b.
Notify Direct Support.
4-26
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