Trouble shooting help.

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Jeremy4601

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If this post isn’t in its proper place, I apologize. I started experiencing a very intimidating sound from under the hood a couple days ago on my way home from work. So I parked my ‘hoe and there’s she’s sat until now that I have a chance to “dig in”. Lol

The noise in question is best describes as a “clacking” sound, only a fast and repeated sound. My initial thought was that one of the deflectors in the air box was kinda flapping back and forth. It was not a steady thing. It was kinda random and short bursts, and I could not seem to do anything to either cause it or to disrupt it when it was happening. Once I got home and parked it started again. Upon opening the hood then sliding up under the front end the noise definitely seemed to be coming from the front of the motor where all the pulleys are. So now I’m thinking I have bearings going out somewhere up there. I know enough to remove the belt(s) and to look for obvious belt wear and/or any play in the pulleys. Any similar experiences or pointers would be greatly appreciated as I am not even a “shade tree” level mechanic.

This may not be related but I feel like I should mention a couple of other things that have had me suspect of a bigger problem.

A. A couple months ago I noticed the passenger side floor boards were soaked (front and rear). No noticeable leaks anywhere inside or out. No water loss in the reservoir. And none of that obvious odor that comes with heater core leaks. I cleared out any leaves or debris that I could find along the perimeter of the engine bay but there sure didn’t seem like enough to cause a problem. The floors have since dried and I’ve not noticed them being even slightly damp since.

B. My low coolant message has started appearing on the dash occasionally. It is not all the time, just now and then. Once again, there is no signs of leaking anywhere under the truck and my reservoir level checks out just fine. I should also point out that thru all of this the truck does not run hot at all. I drive about an hour one way to work and sit in the vehicle for upwards of 30 minutes with the engine running almost daily. The temp gauge always rises consistently and then levels off just below the 210 mark. No signs or smells indicating any overheating or coolant leaks. And the heater works just fine.

I am cautiously optimistic about all of this, but that new noise from under the hood is quite unsettling. I apologize for the novel, but I wanted to be as thorough as possible. Anyone who may have any suggestions or pointers, please have at it... and thanks in advance.
 

wjburken

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See if you can upload a video of the motor running with the clacking to YouTube and post a link here so we can hear what you're hearing.

Remove the belts and run the engine for a short time to see if the sound goes away or not. This will help isolate where the problem is.

Grab a mechanics stethoscope and carefully place at various points to see if you can further narrow down the source of the noise.
 

Doubeleive

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your low-coolant message could simply be the sensor going bad on the bottom of the reservoir (easy fix)
as for the noise, take note of the serpentine belt routing first, then take a 15mm socket and stick it on the belt tensioner and pull to release the belt tension this will allow you to pull the belt off and spin the pulleys by hand and see if one is making any detectable noise.
if none of those then you can just take a 3/8" ratchet and stick it in the center hole of the ac belt tensioner and pull to release the ac belt and see if the ac pump is making the noise instead.
it's the more common cause for the noise in the front of the engine.
if it turns out to the be the ac unit you can just leave the belt off and drive it until you can get it repaired.
 
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Jeremy4601

Jeremy4601

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See if you can upload a video of the motor running with the clacking to YouTube and post a link here so we can hear what you're hearing.

Remove the belts and run the engine for a short time to see if the sound goes away or not. This will help isolate where the problem is.

Grab a mechanics stethoscope and carefully place at various points to see if you can further narrow down the source of the noise.

I tried to get it on video and of course it wouldn’t do it while I was trying.
 
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Jeremy4601

Jeremy4601

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your low-coolant message could simply be the sensor going bad on the bottom of the reservoir (easy fix)
as for the noise, take note of the serpentine belt routing first, then take a 15mm socket and stick it on the belt tensioner and pull to release the belt tension this will allow you to pull the belt off and spin the pulleys by hand and see if one is making any detectable noise.
if none of those then you can just take a 3/8" ratchet and stick it in the center hole of the ac belt tensioner and pull to release the ac belt and see if the ac pump is making the noise instead.
it's the more common cause for the noise in the front of the engine.
if it turns out to the be the ac unit you can just leave the belt off and drive it until you can get it repaired.


I’ve been running it most of the morning and have not heard a peep. I’m gonna let it cool down and then start checking it out.
 

Doubeleive

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I’ve been running it most of the morning and have not heard a peep. I’m gonna let it cool down and then start checking it out.
try turning the ac on and see if the noise comes back, when the ac pumps start to go they can be intermittent and/or only make noise when the rpm's are revved up. might sound like a tin can getting eating by a lawn mower.
 
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Jeremy4601

Jeremy4601

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try turning the ac on and see if the noise comes back, when the ac pumps start to go they can be intermittent and/or only make noise when the rpm's are revved up. might sound like a tin can getting eating by a lawn mower.


That is actually a very good description of the noise I heard. However one of my first thoughts was to turn off the a/c completely and it still made the racket after that.
 

Doubeleive

Wes
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That is actually a very good description of the noise I heard. However one of my first thoughts was to turn off the a/c completely and it still made the racket after that.
the only way to tell for sure is to take the belt off, even with the ac turned off it can still make the noises
how many miles on the truck?
 

Fless

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In addition to what's been mentioned, I'd be checking the exhaust manifold bolts to make sure they're all in place and not broken off. Also, get underneath and look for a loose heat shield that vibrates from time to time.
 

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