kphu

iTrader: (8)

My car gets a strange whistling sound something like that of engine noise from a bad stereo install but it only does this at 38 or 39 MPHs.

It only does this when the car is warm i.e. the temperature gauge is close to the 1/2 way mark. It doesn't do it when the temperature gauge is close to C.

Turning off the radio or chaning the volume has no impact it still does it. Having the heat on or off has no impact. I've tried opening and closing my windows still happens.

Everything I've tried makes no difference in terms of the pitch of the noise or how loud the noise is, its still the same.

I have stock ML Sound system.

No battery light on my dashboard so they only thing that I would guess is that the alternator may be a little worn and could possibly be dieing?

Lastly, I've had the car since summer and it just started doing this about 2 or 3 weeks ago. About 2 weeks ago my car didn't startup because of a weak battery. I recharged the battery and was able to start it up.


Any comments, suggestions or ideas?

UncleRay

iTrader: (2)

This is normal. Don't worry about it :] My car does the exact same thing, and I have not found any cures for it.

kphu

iTrader: (8)

Good to know that I'm not the only one but I do find it extremely odd.

Frankdorn

iTrader: (7)

Happens in my RX, too. No idea...

UncleRay

iTrader: (2)

What I did find however, was that there's an intake for the vent system that feeds are into the car cabin. Pressing the inside air climate control button turns that off. It usually helps, however, there really isn't a fix to this... Unless you ignore it.

Rippaflow

iTrader: (4)

My car used to do that...then the differential went. Now it's fixed, noise is gone.

GS4_Fiend

iTrader: (22)

Just a guess. The alternator is not getting a good ground, a bad ground somewhere or the alternator bearing is bad.

kit cat

iTrader: (6)

sorry I had to
Don't have ML but it sounds like a ground like Fiend said. Weird how it was resolved when changing the diff...

young's 96

I would guess the same thing.

Rippaflow

iTrader: (4)

LOL, despite it being many years old I still laugh when I see his face because I instantly remember the video... I guess we must be talking about two different sounds. The sound I heard would whirl at 39/40mph...anything before or after that, it would be quiet.

ThomasGS4

iTrader: (19)

whooo whooo!

Ok sorry.

Back on topic.

LEXUS_KID

iTrader: (4)

Sunroof

Mr Jokster

iTrader: (8)

It was never confirmed that it was coming out of the stereo/speakers... Is it?

Ghetto Vet

This same thing popped up in my GS4 recently, and I'm 100% sure it's not coming out of the speakers. I'm pretty sure it's actually coming from the air intake. The P/O installed a K&N and it probably needs to be oiled oooor something happened (rock hit? ice forming?) to make a pin-hole somewhere that whistles at a certain speed.

jcat_350

my guess (especially given that its ML, which by the way stands for MEGA LAME) is a bad ground somewhere in the stereo system. My old 300 used to do that with the stock radio, but it was RPM dependent (step on the gas, revs up, pitch of whistle up) so I finally got around to tearing the radio out and wouldn't you know it, somehow one of the nuts that the antenna was grounded to was loose.