I have a 2008 G35x Automatic. It's been very cold recently and when i first start the car it makes a high pitch whistle noise for about 15min or so..then it's gone.
It's not very loud..I can't hear it from inside the car...only when parked and started and im standing next to it.
Did any of you ever experience this?
Thanks for the help

 

No idea...could it be your belt? They usually make chirping/whistling noises when they're going bad.

Plus it is indeed cold out so it could make your serpentine belt act weird, since cold does harden rubber. I would start by checking your belt for any cracks or tears. It is easy to spot.

 

It's normal when it's bitter cold. Usually my alternator makes that noise for a few minutes.

 

my belt has been making noise since the weather got really cold. It's at 50k miles so due for a change anyway. Part on order with Phil now..

 

I don't think alternators are supposed to make noises like that...Are you sure it isn't the belt chirping as it's turning the pulleys of the alternator? Your bearings might be going bad in that case.

 

mine does the same. i guess its common for the cold. i have an 07 g

 

dats the vtec warming up yo!

 

Mine has started that whistling noise to but I'm 99% sure its just the belt on mine. How much does it cost to get the belt changed anyway?

 

So i called the dealer and my "Service rep" says it's the belt..the cold makes it dry or something... Nothing to worry about.
Next visit i'll have the belt changed if anything

 

It's because the rubber gets hard when it's cold. Also probably bc the rubber has dried out over time
Check if your belt needs replacement.

Changing the belt is extremely simple. Only need a breaker bar (with smaller joint, cheaper bars have bigger joints that won't fit in the space in our cars) or a serpentine belt tool from harbor freight tools.It should take like 30 minutes max.

 

^whs, there is a detailed DIY on here making this a ~$40 and 30min 'repair'

 

Does it happen when you drive too because if you any intakes on the car, some of them will whistle while you are driving at certain RPM's

 

I have a coupe that does the same thing and its def not the belts. I've had both the serpentine and AC belts changed recently they're practically brand new and it still does it.

 

^ if you narrow down the sound to be coming form the belt area then check the tension on the belts

 

Mine does the same too its like a whistling humming noise from what sounds like the drivers side firewall area and it only does it when the car is cold goes away when its warm. I have an 06 sedan 6mt.