Rattle coming from the front of the motor

[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

[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

[Okthenbye]

My H3 is 6 mos old and when it was new it made a squeeling noise when cold. It was the serpentine belt. Once they changed it the noise went away.

[f5fstop]

Originally posted by 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.

Cooling fan is totally mechanical, PCM has no control. It is controlled by a mechanical fan clutch.
Maybe it is the clutch? Evidently, something is heating up, and expanding.

[UNOMYFLO]

Its not a squeeling noise it is a RATTLE/ VIBRATION noise. I have been restoring cars and working on them for 20 years and I have never heard a serp belt make a rattle noise. I am with F5Fstop I think it is the clutch fan mechanism...when the heat sensative bushing inside of the mounting area heats it expands and engages it, plus it must tighten up the juncture and eliminates the noise...I would like to have a definite on this though. I could pull the fan mech and check it just for the short start up period to see if it eliminates it.

[UNOMYFLO]

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

[Mike B]

I have a rattle, but it's not when the H3 is cold to warmup--it's when speeding up or pressing the break to stop. I went and checked all areas mentioned in this thread and everything is tight. I did notice that my fan shroud isn't tight and I can shake it, but I can't determine how to tighten it.

[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.

[Frank1500]

Today the dealer changed the belt ,and the noise is gone,no noise at all

have a great 2006
from Germany
Frank

[Game Over]

Originally posted by Frank1500:
Today the dealer changed the belt ,and the noise is gone,no noise at all

have a great 2006
from Germany
Frank

Where in Germany are you at, Reason 'm askin' is I'd like to know how your experience was with the dealer.

Thanks

[UNOMYFLO]

Frank did you have the 50second rattle? or was the noise a squeaking sound?

This am it was warmer then it has been and no noise first time in 3 months...very odd.

I stand by the truck every am and wait for it and this morning nothing....

Shoot if it is the belt I will go to Advance Auto or Autozone or Nappa and buy a belt and put it on myself....the dealer is 2 hours from me.....worth the cash out of my pocket to stop it...I doubt they would send me one.

I would like them to send me the updated rear washer pump so I could put it in myself also.

It would take me longer to get to the dealer than to have the pump installed.


****Not to beat a dead horse but did the belt swap stop the rattling noise? If this is the fix we all are going to get off easy for sure. My biggest fear was a timing chain or something internal inside of the front of the motor.

Let me know
Thanks Frank

Mike

[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]

f5fstop,

Is our fan clutch purely thermal or does the PCM control the clutch?

[f5fstop]

PCM has no control over the clutch fan, purely mechanical, controlled by temp of the air flow through the radiator, as it affects the clutch.
There are aftermarket electric fans available, but I did some research a few months back for H3Lady (I wonder what happened to her ), and the weight savings was not that great, since the fan and clutch are pretty light.

[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]

[Game Over]

'm in Bitburg, there's a dealership right outside where I live but it seems like they're a 'lil difficult to deal with. I tried to ask them to order a roof bar set for me and they said it's better If I oredr it from the states 'coz it's going to be expensive and it's going to take a while though them. I mean Damn..'m paying for it. Anyway, I think it's because I didn't get my truck through them. BTW if u don't mind me askin' how much did you pay for yours, they're selling theirs at 55,000 Euro.

Originally posted by Frank1500:
We live in Aachen and our dealer is in Düsseldorf

have a great 2006
from Germany
Frank

Where in Germany are you at, Reason 'm askin' is I'd like to know how your experience was with the dealer.

Thanks[/quote][/quote]

[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.

[Bruce]

Im having the same problem.
any new ideas or fixes for this?

[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.

[UNOMYFLO]

You say you had the RATTLE right? not a squeel/squeak or any other type of noise?

If you had the RATTLING noise and they changed the belt and it works please let us all know ASAP.

Hard to believe a belt swap would stop a rattling noise but I hope it does.

Thanks so much

Mike