COOLANT NOT WARMED WHEN COOLANT HEATER CONNECTED TO POWER SOURCE (Cont)

TM 9-2320-285-24-1

2-68.

HEATERS TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

COOLANT NOT WARMED WHEN COOLANT HEATER CONNECTED TO POWER SOURCE (Cont)

Step 6.

Use an ohmmeter to check for continuity of 3-wire cord between coolant heater thermostat and coolant

heater element.

If continuity is not obtained, replace 3-wire cord (para 2-73e).

If continuity is obtained, go to step 7 below.

Step 7.

Remove coolant heater thermostat cover (para 2-73e).

Use an ohmmeter to check for continuity of 3-wire cord between coolant heater pump and coolant

heater thermostat.

If continuity is obtained, replace coolant pump (para 2-73e).

If continuity is not obtained, replace 3-wire cord (para 2-73e).

ENGINE OIL HEATER DOES NOT OPERATE

Step 1.

Check if coolant heater and battery warmers are not operating (WATER TEMP gage indicates low and

battery warmers cold to the touch).

If coolant heater and battery warmers are not operating, go to Malfunction 8 below.

If coolant heater or battery warmers are operating, go to step 2 below.

WARNING

Engine oil heater operates from 110 Vac power source. Disconnect winterization system

cable from receptacle at front bumper of tractor before proceeding. Serious injury or death

can result from contact with energized 110 Vac power lines.

Step 2.

Use an ohmmeter to check for continuity of 3-wire cord between engine oil heater and junction box

If continuity is not obtained, replace 3-wire cord (para 2-73d).

If continuity is obtained, go to step 3 below.

2-768