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Volunteer 875 diesel cooling fan does not work

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The sending unit would be my best guess. And its the easiest fix, also its probably the most common. It's a simple heat operated switch. So before replacing it, I'd test it for proper operation. Not a simple bypass, but an actual test. Check it for continuity across the two terminals before you start the motor. Get the motor up to temperature, then test it for continuity again. If it reads the same zero continuity, then I'd replace the sending unit. 

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