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 TM 55-1905-223-24-3
TABLE 2-2. TROUBLESHOOTING-CONT.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Write down the temperatures at which the thermostat begins to open and when it is fully open.
The nominal operating temperature is stamped on the thermostat.
The thermostat must begin to open within 2 (1 ) of nominal temperature.
F
C
The thermostat must be fully open to at least 0.375-inch (9.5 mm) within 22 F (12 ) of nominal
C
temperature.
(4) Replace the thermostat if it does not operate as described.
(5) Visually inspect the thermostat seal for cracks, corrosion, or other damage. Replace if necessary (para.
STEP
11. Check if water pump is malfunctioning.
Replace the water pump (para. 2-33).
STEP
12. Check for obstructed or damaged aftercooler.
Replace aftercooler (para. 2-41).
2. Coolant temperature below normal.
STEP
1. Check if thermostat is incorrect or malfunctioning.
Refer to Malfunction 1, Step 10.
STEP
2. Check if temperature gauge is malfunctioning.
Refer to Malfunction 1, Step 7.
3. Loss of engine coolant (overflow).
STEP
1. Check if cooling system is overfilled.
Drain coolant to proper level (TM 55-1905-223-10).
STEP
2. Check for dirt, scale, or sludge in the cooling system.
Clean cooling system. Refer to TB 55-1900-207-24.
STEP
3. Check for frozen coolant due to incorrect antifreeze concentration.
Check coolant antifreeze concentration. Refer to TB 55-1900-207-24.
STEP
4. Check if engine is overheating.
Refer to Malfunction 1 of this table.
2-26
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