International 4900 Cooling fan

mission_creek · May 20, 2021

Heavyd said: ↑

Wire diagrams for your year are only in actual books, I am off work right now, so I can't look it up. Normally, there is 12volts supplied to the solenoid to shut the fan off. If you jump 12 volts to it and fan shuts off (releases) then you know the solenoid is good. Power for the solenoid will come from a fuse, and typically go through the temp switch. When the engine gets hot enough, the switch opens which kills power to the solenoid to turn the fan on. So you might have to become a detective, and follow the wiring to see where it goes. I think you are on the right track with that temp sensor that is unplugged.
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12 volts to solenoid shuts the fan down. I can’t seem to find a good fuse to start with. Would you happen to know which one of these fuses might share the power for the solenoid?

mission_creek · May 20, 2021

I found a wire I may suspect is for the temp sensor. Just a single wire that looks like a hot wire but can’t find a ground. Can I test this wire by putting 12 volts to it and will it move the gauge in the dash?

Heavyd · May 20, 2021

Looks like F2 should supply the fan. I wouldn't put voltage to any wire I wasn't sure what it was for.

mission_creek · May 21, 2021

Could I do the opposite and run power through the fuse side and use a test light to determine if the broken wire I suspect is for the temp sensor?

Inderjit · May 22, 2021

Here are the diagrams from Navistar for with or without A/C. F2 is the fuse that supplies the fan switch.

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