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[05omegav6]

Might be one of the actuators in the climate system

Ignition off, press any button on the climate panel (except the rear screen one), and you should hear a noise

Might also be a wire drumming somewhere if the radio has been out...

[Mr.OmegaMan]

Might be one of the actuators in the climate system

Ignition off, press any button on the climate panel (except the rear screen one), and you should hear a noise

Might also be a wire drumming somewhere if the radio has been out...

Will give that a try, I did reset the climate control by pressing off/auto did that fine few days back.

So you want to play around with the climate control and see if it makes that buzzing sound, i'll try give it a go today but its so windy today it's doubtful i'll hear anything 

[Mr.OmegaMan]

After another run after trying everything above there is still a buzzing/rattle type sound over 40mph or over rough road surface usually..

Have tried ruling other things out like cdc magazine, ashtray, air vents, auto gear leaver, glove box, fuse box door etc. Although there is a little play in the fuse box door but doubt its that some how it sounds more like its coming from the radio area  Have even tried it with and without CDs in the slot and cdc changer..

Is there a how to guide on removing a NCDC unit might have a look behind there then shake the unit once its out 

[Mr.OmegaMan]

Been checking google on this subject on verious cars and I keep getting the same results pretty much "climate control fan" not saying its going to be the case with the Omega but isn't a climate control system pretty much the same idea on all cars ?..

Anyway I'm not sure if this will rule this fan thing out or not but it does make this buzzing/rattling/humming type sound when everything's off while driving above 40ish mph not constant every few seconds say.

I'm sure I can live with it especially as its only faintly noticeable "but its there nevertheless" but just turn the radio on higher and keep the engine revs high enough to drown out the noise if its one of these phantom noises which can't easily be traced.

Would like to try and get the radio out to see if there's anything behind there that could cause this but I've only got the tool that can remove the radio from my GLS radio which doesn't fit the NCDC series radio so i'll have to use thin screwdrivers or something unless somewhere sell these for this radio ?

Oh Joy there's always something with Omega's 
Then again that could be said about most cars 

[TheBoy]

Turn the climate OFF completely. Does it go?

Turn the NCDC OFF. Does it go?

[Mr.OmegaMan]

Turn the climate OFF completely. Does it go?

Turn the NCDC OFF. Does it go?

Yep as previously said tried all above suggestions. Must be something lose behind the radio (area)

[omega3000]

Maybe a bee stuck in vent 

[Mr.OmegaMan]

Maybe a bee stuck in vent 

Hope not cant stand them doubtful tho probably something loose causing vibrations or something.

[Mr.OmegaMan]

Still have this problem, it does sound like its possibly coming from behing the two front center air vents 

[RobG]

Foreign body in ducting resonating when car reaches certain speed

[Mr.OmegaMan]

It's okay 70 upwards and most speeds on smooth surface roads. It's worse under accelaraition and rough surface roads 

[Mr.OmegaMan]

Had a look behind air vents nothing seems lose

[Mr.OmegaMan]

That's it i'm not going to be stripping everything out to find this buzzing noise whatever it is, I'll just have to live with it or sell it which seems a tad daft to sell just because of this little noise now and again.

This is probably unrelated but the main beam blue dash light doesn't work any more  probably the bulb, Just encase is these a fuse for the bulbs in the dash ?

[Mr.OmegaMan]

Ahhhh just back from a drive and it is so annoying, where's the hammer 

[RobG]

That's it i'm not going to be stripping everything out to find this buzzing noise whatever it is, I'll just have to live with it or sell it which seems a tad daft to sell just because of this little noise now and again.

This is probably unrelated but the main beam blue dash light doesn't work any more  probably the bulb, Just encase is these a fuse for the bulbs in the dash ?

Nope