Overheat Fans Keep coming On!? - Ford Powerstroke Diesel Forum
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Old 05-23-2009, 06:05 AM
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Overheat Fans Keep coming On!?

My overheat fans keep coming on at least once or twice with a light load any Ideas?
New coolant and thermostat less than 6months ago.
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Old 05-23-2009, 07:47 AM
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waterpump maybe??
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Old 05-23-2009, 07:51 AM
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all three of my trucks did that
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Old 05-23-2009, 01:35 PM
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This is my first diesel so I figure if it normal someone will let me know. All of my Mods got done when it was cool outside and then winter so I was just checking. I thought maybe a Intake Air temp sensor might trigger that or the tech got a air pocket when putting new colant in.? Because my gauge reads perfect no change at all same temp.
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Old 05-25-2009, 06:15 PM
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Its fine dont worry. As long as its not overheating and the heat in the cab is hot when you want it too its fine. The cooling fan has an electroviscouse clutch and is pcm controlled and will cycle on and off on its own.
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Old 05-25-2009, 06:19 PM
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My 04 starting doing that when the Oil Cooler went bad. Are you monitoring those temps? Nothing else got hot on it..just the oil, at just before 250 it would come on.
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Old 05-25-2009, 06:45 PM
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Like the others said, the fan coming on is completely normal and will run even more as it gets hotter this summer. It's not an "overheat" fan. It's an engine cooling fan. It can even run when it's cold outside but will run more/faster when you're hauling a load and/or in warmer temperatures.
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Old 05-26-2009, 04:19 PM
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Thanks for all of your help and info sounds like a non issue so it might be SCT and exhaust time just want to make sure I have all of the bugs out before the power adders!!!! Oh and no I am not monitoring engine oil temp loco but I will keep that in mind!
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Old 05-26-2009, 04:55 PM
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If I were you I would at least put a scan tool on it and make sure your oil temp and your engine temp are within 20 deg of each other. that was the first sign my oil cooler went bad, my fan kept kickin on at normal temps. Took my valve covers off they we loaded with junk from coolant getting into my oil. Good luck with it..
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Old 05-26-2009, 05:27 PM
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Yep, checking you oil temp is a good idea if it is indeed running a lot. Good point. It just sounded to me like it was just occasionally ramping up like normal.
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