Symptom Tree
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Coolant level is above specification |
Check the coolant level. Refer to the OEM service manual. |
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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. Refer to the OEM service manual. |
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Radiator cap is not correct, is malfunctioning, or has low-pressure rating |
Check the radiator pressure cap. Refer to the OEM service manual. |
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Fill line or vent lines are restricted, obstructed, or not routed correctly |
Check the vent lines and the fill line for correct routing and for restriction. Refer to the OEM service manual. |
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Coolant fill line is restricted or obstructed |
Check the coolant fill line for restrictions or obstructions. Refer to Procedure 008-066 (Coolant Level) in Section 3. |
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Engine is overheating |
Refer to the Coolant Temperature Above Normal symptom tree. |
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| Contact a Cummins Authorized Repair Facility |
