ARCTIC HEATER KIT

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cont)

Table 2-9.

Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ARCTIC HEATER KIT

1. COOLANT PUMP FAILS TO OPERATE (INDICATOR LIGHT DOES NOT COME ON) (MODEL A).

Step 1.

Remove heater compartment cover (para 20-2). Check for loose electrical connections at

coolant pump switch and circuit breaker connections.

Tighten loose connections.

Step 2.

Check for defective circuit breaker No. 4 (fig 2-2). Test voltage across circuit breaker No. 4.

If 24 vdc is present, go to Step 3.

If 24 vdc is not present, replace circuit breaker No. 4 (para 7-43).

Step 3.

Check for voltage at terminal No. 1 of coolant pump switch. Place positive (+) probe on

terminal No. 1. Place negative (--) probe on known good ground.

If 24 vdc is present, go to Step 4.

If 24 vdc is not present, repair or replace wire No. 1082.

Step 4.

Check for voltage at terminal No. 2 of coolant pump switch. With switch in ON position,

place positive (+) probe on terminal No. 2. Place negative (--) probe on known good ground.

If 24 vdc is present, go to Step 5.

If there is no voltage, repair coolant pump switch (para 20-2).

Step 5.

If problem has not been solved, notify the supervisor.

Change 7

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