Answer
Jul 17, 2025 - 10:22 AM
If the engine temp warning light is stuck on all the time on your Case 1840, even when the engine’s cold, there’s a good chance it’s either:
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A bad coolant temperature sensor – That little guy might be shorted internally and sending a false “overheat” signal even when everything’s fine.
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A grounded or damaged wire – Check the wiring from the temp sensor to the dash. If the wire’s rubbed through somewhere and grounding out, it'll light up the warning like you’re cooking the engine — even if you're not.
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Faulty gauge cluster or warning module – Less common, but worth a look if the sensor and wiring check out.
A quick test would be to unplug the sensor with the key on. If the light goes out, it’s probably the sensor itself. If it stays on, then it’s wiring or dash-related.
In any case, I think you may want to grab this 👉🏻 Case 1840 Skid Steer Loader OEM Service & Repair Manual. Not only will it help you troubleshoot this issue, but it also contains everything you need to service and repair your loader and keep it running smoothly.
