| Malfunction (symptoms) |
Probable Causes |
Corrective action (remedies) |
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| Engine Overheats |
Coolant level too low |
Replenish coolant |
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Radiator pressure cap malfunctioning |
Pressure test cap. Replace if defective |
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Belts on water pump / fan slipping |
Tighten each belt to 100 pounds tension. |
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Thermostat defective |
Replace |
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Filler neck cap seat corroded |
"Clean |
replenish coolant |
then replace cap." |
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Radiator hose collapsed (a defective bottom hose could collapse at high engine speed) |
Replace |
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Coolant pump impeller defective |
Replace pump. |
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| Excessive coolant overflow |
Pressure cap defective |
Replenish coolant and replace cap |
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Pressure cap missing |
Replenish coolant and install replacement cap |
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| External coolant leakage |
Hoses or clamps loose |
Tighten loose clamps; replace if defective. |
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Coolant pump gasket defective |
Replace |
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| External oil leakage in transmission oil cooler system |
End fittings loose or defective |
Tighten loose fittings; replace hose assembly if defective |
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| Slow engine warm-up |
Hose defective |
Replace |
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Thermostat defective |
Install serviceable thermostat |
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| Coolant pump noisy |
Impeller bearing lacks lubricant |
Lubricate pump with water pump grease |
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