whistling noise...
 

when I accelerate (engine cold) there is some whistling noise from engine bay, usualy between 1500-1600 rpm. After 10-15 minutes noise seems to go away... water pump ?

Oh... I've the same problem , the details 're
1. start at 1300 until 1600 rpm .
2. it's occur always.
3. I notice that it occur after i'd change outer cv joint both side. The suspension's fine.
4. It's quiet during changing gear .
4. the sound come from only the left side, near the left A pillar.
What's it could be?

I'm sure noise coming from engine, it could be many things. It only happens when its cold outside. Seems not a lot of people have this problem.

Same thing happened...
 

...on my 530 and it was the water pump.

How long u drove 530 with this noise?

Only about two weeks. I got a flashlight and checked the engine bay very closely and found coolant seeping from the water pump. I immediately quit driving the car and replaced the water pump. I was afraid the pump would go completely and I would end up with a warped head.