TM-9-2350-277-10

CARRIER, M113A3, M577A3, M1059A3, M1064A3, M1068A3 AND M58

TECHNICAL MANUAL; OPERATOR’S MANUAL

TM-9-2350-277-10 - Page 550 of 889

TM 9-2350-277-10

TROUBLESHOOTING TABLE — Continued

0089 00

INITIAL SETUP:

Maintenance Level

Operator

ENGINE COOLANT HEATER

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1.

HEATER DOES

NOT START WITH

RUN-OFF-START

SWITCH HELD IN START

POSITION. HEATER

MOTOR RUNS.

1.

Check to see if fuel tanks manual shutoff

valves are closed.

Open fuel tanks manual shutoff

valves (WP 0004 00).

2.

HEATER DOES

NOT START WITH

RUN-OFF-START

SWITCH HELD IN START

POSITION. HEATER

MOTOR DOES NOT RUN.

1.

Push PRESS-TO-TEST switch on engine

coolant heater control box to test for

electrical power. If light does not work,

check for loose electrical connections at

control box and heater.

Tighten loose connections.

2.

Check to see if battery connections are tight.

Notify unit maintenance to tighten

loose battery connections.

3.

COOLANT HEATER

OVERHEATS.

1.

Check to see if one or both coolant shutoff

valves are closed.

Open coolant shutoff valves

(WP 0062 00).

4.

COOLANT HEATER

OUTPUT IS TOO LOW.

1.

Check to see if the HI-LO switch is in LO

position.

Move HI-LO switch to HI position

(WP 0062 00).

5.

BATTERIES OVERHEAT.

1.

The air temperature is too warm to need the

engine coolant heater

Turn off engine coolant heater

(WP 0062 00). You do not need

to use engine coolant heater if

temperature is above -25 F(-32

C).

2.

The engine is running at the same time as the

engine coolant heater.

Turn off engine coolant heater

(WP 0062 00) as soon as the

engine starts.

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