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  #1  
Old 07-15-2013, 01:19 PM
JE13BigHorn JE13BigHorn is offline
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Default Clutch Fan

I've done some searching and can't really get a definitive answer to my question. My Ram has 3500 miles on it... Hemi motor... my clutch fan is extremely loud at times. There doesn't seem to be any rhyme or reason for when it happens. It has happened in the morning when first cranking up. It has also happened after driving 5 miles then going through a drive thru and when I leave the drive thru it gets really loud for a half mile or so. It also happens at times in the afternoon when I leave work. At that time it's 90 degrees and it stays loud for the same amount of time as it does in the mornings after setting all night. I'm wondering if the clutch fan may be bad or if this is normal on the '13's?
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Old 07-15-2013, 01:25 PM
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I haven't noticed any noise out of mine. Though I've only got 1300 miles on mine. Kinda sounds like it could be going bad on you?
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Old 07-15-2013, 01:37 PM
JE13BigHorn JE13BigHorn is offline
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I'm thinking it may be. I've listened to a couple of trucks I've seen here and there and haven't really heard the same sound out of them. I was just trying to kind of get a feel for what everybody else thought before I headed to the dealership.
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Old 07-15-2013, 02:09 PM
huntergreen huntergreen is offline
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i have an 11 and have never heard mine. maybe time for the dealer to check it out.
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Old 07-15-2013, 02:13 PM
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Are you sure it's not the electric fan you are hearing? If the AC is on the electric fan will cycle on/off continuously.
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Old 07-15-2013, 02:16 PM
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that is a good point^^^^^^^^^^^
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Old 07-15-2013, 03:04 PM
JE13BigHorn JE13BigHorn is offline
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Sean, That was my initial thought. However, it does it with the air on or off. That's another thing I've tried eliminating. The a/c doesn't seem to have any affect. This is a loud sound that conintuously goes up with the RPM's of the motor. It is loud and seems to rob a little acceleration.
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Old 07-15-2013, 03:25 PM
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I see. Hm I suppose the clutch fan could be bad just odd at such a low mileage.
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Old 07-15-2013, 03:36 PM
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To answer your question about fan clutches JE13BigHorn; Many different type of clutches to fans depending on the vehicle requirements; A Standard, Heavy Duty, and a Severe Duty. But as far as typical operation, fan clutches are either Thermal or Non-Thermal(also known as Centrifigal). Our Ram uses the Thermal, which when starting cold, the fluid inside the clutch has settled in the working area from sitting overnight. This is what engages the clutch fan at first startup but disengages shortly after. The air temp coming through the radiator is sensed by the thermal spring on the front of the thermal fan clutch. It expands and contracts with the change in air temp operating a valve inside the clutch. When cold, the silicone drive fluid is pumped from the working area to the reservoir. When hot, the valve opens allowing fluid from the reservoir to be transferred to the working area thereby increasing the fan speed. The clutch disengages as the air temp decreases, closing the valve and allowing the silicone fluid to be pumped back into the reservoir. SOOOO, long story short, a thermal fan clutch is engaged on a cold start up because the fluid has drained into the working area when the engine is shut off. The fan clutch will slow down shortly after startup as a result of a pumping action produced by a difference in speed between the shaft and the body of the clutch.
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Old 07-15-2013, 03:59 PM
JE13BigHorn JE13BigHorn is offline
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Gantman, That makes sense. So would you be concerned that it does it even after operating for a while. There are times when I drive a few miles, whether it be through mcdonalds or just stopping at a red light, that when I accelerate again the fan is loud for a few thousand feet up to a mile from beginning acceleration. That is what bothered me... That and the fact that the fan is extremely loud. I'm probably going to take it in to the dealer to have it checked, but I didn't want to end up in there and having not done any research to help explain my situation. I appreciate your explanation. It does definitley make sense.
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