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Why Is My Excavator Overheating? How to Diagnose Every Cooling System Failure Before It Destroys Your Engine

An excavator that is running hot is not a problem you can defer until the next service. Every minute an overheating excavator keeps working is a minute closer to head gasket failure, warped cylinder heads, or a seized engine. The repair cost for a cooling system fault caught early is measured in hundreds. The repair cost for an engine destroyed by sustained overheating is measured in thousands, sometimes in the cost of the machine itself. The challenge is that an excavator's overheating has multiple possible causes and they are not always easy to distinguish from each other on site. A blocked radiator, a failing hydraulic oil cooler, a dead fan motor, and a collapsed hose can all produce the same temperature gauge reading. This guide works through every common cause of excavator overheating, how to identify which component has failed, and what to do and what not to do while the diagnosis is underway. For the full range of excavator cooling system components, visit our radiators and cooling system parts section.