Symptom Tree
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Coolant level is above specification |
Check the coolant level. Refer to Section 3. |
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External coolant leak |
Inspect the engine for coolant leaking from hoses, draincocks, water manifold, jumper tubes, expansion and pipe plugs, fittings, radiator core, air compressor and cylinder head gaskets, lubricating oil cooler, water pump seal, cylinder block, and OEM-mounted components that have coolant flow. |
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Radiator cap is notcorrect, is malfunctioning, or has low-pressure rating |
Check the radiator pressure cap. Refer to the OEM service manual. |
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Cooling system hose is collapsed, restricted, or leaking |
Inspect the hoses. Refer to Section 7. |
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Coolant fill line is restricted or obstructed |
Check the coolant fill line for restrictions or obstructions. Refer to Section 7. |
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Engine is overheating |
Refer to the Coolant Temperature is Above Normal – Sudden Overheat symptom tree. |
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| Contact a Cummins Authorized Repair Facility |
