HIGH PITCH WHISTLE , HAPPENS MORE WHEN IT IS COLD. CAR RUNS FINE TURBO IS QUIET

 

Check the air cleaner assembly. It could be as simple as a leaf caught up in the intake, it has happened before. Also check rubber hoses to the intake manifold for cracks or loose clamps.

 

secondary air pump
might have a hose off

 

What is it with the hose's on thouse things. mine came off on both ends, and was a pain in the behind to put back on.[>:]

 

I have a 2001 Beetle...not a turbo, but when I start it my car it will sometimes sound like the belts are being ripped at.... (Kinda like when you use a scissor to make ribbon on a present curl up...but much much louder.) Maybe you call that sound a "whistle?" I brought the car to the dealership and they said it's nothing to worry about. It only happens every once in a while though, I'm not too concerned. Hasn't been a problem aside from the embarassment I get when people look at me funny.

 

Fan Belt?

 

Mine does it too...bout 1-2 second sound. Prolly starter gear.

 

Could also be your secondary air pump going or about to be bad. Mine does it too I just haven't found a replacement at the junk yard yet. Easy to replace. it's mounted at the front right under the intake manifold, next to the orange oil dipstick.