Engine noise
Senior User
Joined: Jan 2004
Posts: 200
Likes: 0
From: Gardnerville, NV
yes it goes away when coasting.
rear axle? hmmm. will try and check it out when I get back from my trip.
the sound is when I am slightly on the go pedal or cruising at 70 mph.
Best description I can do is it sounds like when your fan comes on in the HOT weather. taxing the motor on how it feels too
thanks all for the idea's
rear axle? hmmm. will try and check it out when I get back from my trip.
the sound is when I am slightly on the go pedal or cruising at 70 mph.
Best description I can do is it sounds like when your fan comes on in the HOT weather. taxing the motor on how it feels too
thanks all for the idea's
Senior User
Joined: Jan 2004
Posts: 200
Likes: 0
From: Gardnerville, NV
The best way to check the fan clutch is with the motor cold and not running, then try to turn the fan by hand. If it turns without much resistance it should be okay, if it is locked up and won't turn it is probably bad. Mine had some "play" in it as well, it could be rocked back and forth slightly. The water pump has a weep hole that will start to have coolant leaking from it, tell tale sign the water pump is on the way out.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
A locked up fan clutch will also cause the fan to howl at 2000+ rpm, whether you are in gear or neutral and simply revving the motor.
It won't matter if you are traveling or not, the fan is driven by engine rpm only.
It won't matter if you are traveling or not, the fan is driven by engine rpm only.
Hotshot
Joined: Feb 2007
Posts: 10,499
Likes: 10
From: Sterling Heights,Mi
What causes them to lock up Dan, I normaly notice that to be the case when the AC is on or during the summer months. And it is loud as all get out between 1500 and 2200 RPMS..
By the way, that was why I was asking if the defrost was on..
By the way, that was why I was asking if the defrost was on..
Posting Guru
Joined: Apr 2009
Posts: 2,447
Likes: 1
From: Northern Idaho
EWW, EWW! I CAN ANSWER THIS!! 
That would be the fan clutch for 200 please!
You see the fan clutch sits between the fan and the idlers pulley and is driven by your serpentine belt. If the clutch goes bad, well it can either lock up and keep your fan on or it can idle more then it's supposed to and not run your fan at all or at the wrong time.
Also, during the summer months you are pulling heat through the radiators and since you're creating heat in the cooler for the AC system this will cause the clutch fan to kick on. It's quite common but not while driving down the road unless it's super hot or you're not getting enough air through the radiators.
That would be the fan clutch for 200 please!
You see the fan clutch sits between the fan and the idlers pulley and is driven by your serpentine belt. If the clutch goes bad, well it can either lock up and keep your fan on or it can idle more then it's supposed to and not run your fan at all or at the wrong time.
Also, during the summer months you are pulling heat through the radiators and since you're creating heat in the cooler for the AC system this will cause the clutch fan to kick on. It's quite common but not while driving down the road unless it's super hot or you're not getting enough air through the radiators.
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Posting Guru
Joined: Sep 2006
Posts: 1,081
Likes: 1
From: Montana
ok, the blades turn with mimimal resistance both ways. so I guess its not the clutch fan.
that is turning them by hand right?
would the fact I have some Custom Card board to block the radiator have anything to do iwth it? helps keep the motor warm on the hwy.
that is turning them by hand right?
would the fact I have some Custom Card board to block the radiator have anything to do iwth it? helps keep the motor warm on the hwy.
Hotshot
Joined: Feb 2007
Posts: 10,499
Likes: 10
From: Sterling Heights,Mi
You might be hearing a wind restriction..
Okay Visseroth, I like your answer, but could you explain a little more, in other words, I normally hear it for the first 1/4 to half mile, are you saying that it is that hot under the hood that the clutch is engaged until the under the hood temp drops?
Okay Visseroth, I like your answer, but could you explain a little more, in other words, I normally hear it for the first 1/4 to half mile, are you saying that it is that hot under the hood that the clutch is engaged until the under the hood temp drops?
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Posting Guru
Joined: Apr 2009
Posts: 2,447
Likes: 1
From: Northern Idaho
You might be hearing a wind restriction..
Okay Visseroth, I like your answer, but could you explain a little more, in other words, I normally hear it for the first 1/4 to half mile, are you saying that it is that hot under the hood that the clutch is engaged until the under the hood temp drops?
Okay Visseroth, I like your answer, but could you explain a little more, in other words, I normally hear it for the first 1/4 to half mile, are you saying that it is that hot under the hood that the clutch is engaged until the under the hood temp drops?
For instance. The time I had my fan on the most was when I was traveling down the hwy at 78 mph with a very small trailer behind me. When I started to slow down and was pulling into a rest stop you would hear the fan kick on and it would make quite a ruckus when the RPMs came up. You see, from working the engine decently hard I had generated enough heat under the hood that when the air flow started to slow down it kicked on to try and increase air flow and bring the temps back down.
Does your fan kick on at every stop all the time? It shouldn't. It should only kick on when the engine is hot or the radiators are hot and need air flow.
Edit: I also might want to add that a bad clutch can kick on at the wrong times because it is failing but be sure that your radiator fins are not all folded over and that you don't have anything in the way causing the radiators to heat up and trigger the clutch.
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Posting Guru
Joined: Sep 2006
Posts: 1,081
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From: Montana
willl try that at lunch time. starting out does seem weak is why I thought tranny, but it also does it at 70 mph and the TC should be locked. anyway I will keep checking. its finally above zero so I can crawl around the truck a bit more.
and just so all that is helping. (much appriciated by the way) I am heading out of town this afternoon and dont always get on a computer over the weekend. so when I dont reply later today or this weekend is why.
and just so all that is helping. (much appriciated by the way) I am heading out of town this afternoon and dont always get on a computer over the weekend. so when I dont reply later today or this weekend is why.
Posting Guru
Joined: Apr 2009
Posts: 2,447
Likes: 1
From: Northern Idaho
A locked clutch fan will cause a loss of about 50 to 75hp. They are horse power sucking fans for sure so yea, I would suspect the clutch on the fan.
You will notice a horse power loss during acceleration for sure with that fan on, there's no doubt there!
You will notice a horse power loss during acceleration for sure with that fan on, there's no doubt there!
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Posting Guru
Joined: Sep 2006
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From: Montana
but if it spins by hand both ways when motor is off, can it still be the clutch fan?
Senior User
Joined: May 2007
Posts: 393
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Make sure you are checking the fan on a cold motor because resistance is reduced with a warm motor. Another thought, how about IC boots? Maybe not a blown one but a loose one. Just a thought since you seem to have some power issues as well. Maybe check the PS pump fluid level as well, they can whine sometimes or make other odd noises. HTH.