My 03'G35 Sedan make whining noise/power-up type sound when accelerating at lower speeds ( 20-40 mph). Its not doing it at higher speeds.

I took it to couple of local service centres and they couldn't find anything.

Frustrated when frns ask me about this sound

 

Do you have the mechanical fan setup?

If so test your fan clutch.

 

Hit my ignorance with a baseball bat, I am not sure about the fan set up.

can you please educate me or point out where I can do it myself

 

Pop your hood and look behind the radiator. There is a large fan. It's either electric, or it's connected to the engine.

If it's connected to the engine, grab it and try to spin it ( engine off of course) and see how hard it is to spin. If its hard, the fan clutch is prob toast.

 

Thank you , I will check this.

 

also any chance of getting the sound on vid so we can hear it maybe?

 

I've also had a similar sound. Sounds like it's right behind the firewall on driver's side. Winding up (similar to a gear drive on chevies or fords) can be heard most at lower rpms, like just taking off. I too, will check the fan.

 

did you install a supercharger?
maybe its the hyperdrive powering up


or since your car is an 03 it might be the fan since the hyperdrive only comes on the 04...

 

^ no I didn't

 

My fan is ridiculously loud, and no the bearing isn't shot, the sound of the airflow is annoying.

 

I checked my fan, and its not hard to spin. It looks normal to me. Not sure, what the problem is

 

does it happen when you are in neutral just reving or only in drive?

 

I didn't try it in neutral, but always on drive

 

if it does it in neutral then its engine related but if not then drive train

 

Is it a certain RPM range? Does it happen only under load (not in Park)? Does it sound like your muffler is going?