Rattle coming from the front of the motor

[UNOMYFLO]

Susan great to know I have heard a belt make some strange noises in the past but never the metal to meatl rattle noise. I will get the belt replacerd annd llet you know.

But as you say it did it EVERY TIME and now its gone proof enough for me.

Thanks for taking the plunge on this one for all of us. Seems like GM used some crap belts since so many of us are experiencing this problem.
I might even go to NAPPA and get my own and replace it myself.

Thanks for the help and please let us know if the rattle rears its ugly head again.

Mike

[Susan]

I just picked mine up from service for this issue (at least it sounded the same as the descriptions here). They changed the serpentine (sp?) belt and cleaned the pullies. Hopefully, that will fix it. I will not know until the next time I start it cold.

There is a TSB for the Colorado for coolant getting on the belt and causing some noise. I found it on a Colorado site...same engine; possibly same noise/cause? We will see.

[Susan]

They cleaned the pulleys and replaced the belt. The tech said there was some 'contaminant' on the belt.

When I dropped it off they mentioned that some of the belt tensioners were not torqued correctly and that sometimes causes a noise. There is nothing about retorquing (sp?) on my ticket, but would they likely check that when changing the belt? That might be worth checking also.

[H3CAN]

Hi,

I beleive it is the fan clutch too...as when the engine is warm, or at least started earlier in the day, the noise does not come up. also,as soon as you turn your engine, the fan is usually engaged for a few seconds and the noise is not heard.

[UNOMYFLO]

hummerdonthurtem

I checked it out this am and the only thing I see in there behind the grille just left of center is the horn?

Am I missing something bro?

Can you shoot me a pic of what wxactly was making the rattle and what you tightened up?
Its driving me crazy would be nice to stop it.

F5Fstop I hear ya but no shield on the face/front of the motor the noise is definately coming from the front. I'll be honest with you it really souinds like its the clutch fan mechanism.....

hummerdonthurtem send me some pics of what exactly you are talking about....much appreciated man.

Mike

[Frank1500]

We live in Aachen and our dealer is in Düsseldorf

have a great 2006
from Germany
Frank[/quote]
Where in Germany are you at, Reason 'm askin' is I'd like to know how your experience was with the dealer.

Thanks[/quote]

[UNOMYFLO]

Tell them to change the belt, there is a TSB on this issue. There were contaniments antifreeze that got on a ton of these and I too thought the noise could never be the belt and it was it could have been the tensioner bolt but the tech said it was fine he checked the torque. DEmand it or call GM and tell the dealer you will...they will change it. Leaving the trucvk overnight is crazy for a belt change. Shoot when I was down there I heard the new off the truck H3's doinmg the same damn thing on the way around the back to be prepped. Have them start a few that are cold on the lopt or better yet demand the belt change.


I thought I put the TYSB in my prev post for the TSb F5 can you help here?

Thats total BS for a 40 dollar belt.

WTF?

[Frank1500]

Hi we got our H3 in Germany and had the same noise after 100 miles,the dealer will change the belt next week i dant belive this will sove the problem
keep me informed
Frank

[f5fstop]

I have actually listened for this rattle on cold mornings and have not heard a rattle. This damn H3 seems to be flawless, and was until last week, when the rear passenger door outside handle stopped working.
Pulled off the trim panel and the handle's latch rod fell off, repositioned it, popped it back into place, and all is well.
I can hear a slight squealing on a cold engine start, but pretty sure this is the tensioner or idler pulley and eventually will take it into the dealer for repair.

[UNOMYFLO]

This is so wide spread I wonder if HUMMER knows about this problem....?

[psywzrd]

I have this noise too - drives me f***in' nuts! I was going to have them check it out when I go for my first oil change and have the recall work done.

[ChevyHighPerformance]

How about if we try getting this data. I have the metallic rattle and I noticed that when I start the engine the fan is engaged for about a minute (even after the H3 sets all night in 20 F weather). You can hear the fan noise when you rev the engine slightly.

Can you say if: 1) you have the noise and 2) you hear the fan noise when starting a cold engine.

[UNOMYFLO]

Yes plese take it in...due to scheduling I have been unable to do this.

My feeling is it is either the clytch fan mech or the belt tensioner.

This am it was 68 and I had the rattle, used to be it only did it when cold....now I am not convinced of that.

I did this am pop the hood and noticed the belt tensioner moving quite a bit and after the rattle went away I did her some noise from the tensioner perhaps it is the culprit? just cant be sure.

If you could take it in and leave it you would be helping a lot of people here on this thread.

The serpentine belt swap and the pullys being cleaned is not the fix so please tell them this.

It is in the front of the motor and I am almost 99% sure it is not a sheild of some kind
ie: exhaust shield or plastic motor cover.

thanks Boulder keep us updated.

UNO

[UNOMYFLO]

I also used a long extension and pressed it against the heat shield and it diodnt change nor stop the noise.

I thought it might be noisy lifters until the oil reaches the rockers and heads totally but, its not the typical rocker ticking it a definate rattle like a chain dragging across a coke can....wtf?

F5Fstop as you know also these noises can radiate from nowhere and sound like they are right next to you.

Hopefully the pics or a better description form hummerdonthurtem will help me either fix it or rule that out like I said all I se in there is the horn assy. hummerdonthurtem you are talking about looking through the bars in the grille right?
in front of thee radiator? I got nothin but horn there..

M

[StarsnBars]

I get the same noise too. Im going to call my dealer and see if he has any info. Will post back if I find anything out.

[hummerdonthurtem]

Here is a picture, looking straight at the front grill. The two arrows show the locations (approximate) of the bolts. Note that the upper bolt is a little behind the grill.

[boulderhummer]

thanks unomyflo, your right moving sucks,,,suburbs of philly pa here, 30 minutes north of the city, not moving far from there..
good luck with your situation too...

[H3CAN]

Hi,

I have the same rattle noise...also when cold (which is always as I live in cold Canada)
It also goes away when the engine warms up...keep me posted if you find the solution....thanks

[f5fstop]

I know some early vehicles had some idler pulley problems, but it was more like a squeak. I guess it might cause a rattle too on some applications.
In my opinion a belt would squeal or squeak, but not rattle.

[ChevyHighPerformance]

I hear the same noise only for the first minute or so. It seems that the PCM is programmed to engaged the fan even though the engine is cold perhaps to place a laod on the engine to help it heat up and get into closed loop.