Fan sound from engine sometimes???? - Ford Powerstroke Diesel Forum
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Old 12-17-2013, 06:17 PM
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Fan sound from engine sometimes????

Some times in lower rpm range the motor sounds like a giant fan blowing...... Best thing I can think of anybody else's 6.4 do this? What is it?



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Old 12-18-2013, 08:12 AM
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It's probably just the fan clutch kicking on.
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Old 12-18-2013, 08:30 AM
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No it's not the actual fan it just sounds like one when you accelerate if you let off and then go again it goes away
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Old 12-31-2013, 05:37 PM
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Mine does this in the summer months. On really hot days, when the truck is warm, when I start out in first, I often hear the fan running at engine RPM... It does turn off after a few seconds. Seems completely normal to me. After running much larger trucks hauling significant loads up hills, that fan sound is normal when the thermostat says "I am hot and not getting enough air".
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Old 12-31-2013, 05:44 PM
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Mine does this even when it is freezing out it only does it in low rpm. I don't think it is the actual fan but idk it may be the way the fan clutches work but, if I let off and let it go back to idle and slowly accelerate again the sound stops


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Old 01-03-2014, 04:49 AM
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Possibly a fan clutch issue, or a faulty relay/switch telling the fan to turn on when it isnt needed. If the coolant isnt screaming hot, then it really has no reason to turn on. I only notice mine when it is really warm out. I have never heard it in the winter months. As long as it does turn off, its at least liveable. That fan will suck a ton of power from the motor. And it can be really loud. Might want to have someone look over the fan systems and see what is going on. Hard to say if that will get any worse. I think that the fan not running would be your greatest risk to causing engine issues down the road.
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