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roymeyer

Diesel Generator Shuts Off - High Coolant Temperature

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Hey guys. I have a 7500 Onan diesel generator that runs for a minute and shuts down with a high coolant temperature fault code, but the coolant level is good and nothing feels hot, just warm. I went ahead and changed the fuel filter and air filter hoping for an easy fix but the same problem exists. The owners manual is of no help at this point. There is only 223 hours on the unit, which is in a 2005 Fleetwood Expedition. Any help would be appreciated. Thanks,

Roy

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If my memory serves me correctly you will find this sensor screwed into the thermostat housing. I think the thermostat housing is attached to the cylinder head on the back side of the engine (the side where the water pump and belt is located). Also here is part number if you have one of these generator models, HDKAH/J/K/V/TU. Part number 193-0318.

It will be necessary to remove the top cover from the generator in order to gain access to the sensor.

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