weird noise coming from my E320 Coupe....

[adaptive]

At low speeds, when i lift off the accelerator, there is a whirring sound coming from the front of the car. Its not really loud, but loud enough to be heard easily
It stops as soon as the accelerator is depressed, even slightly
There is no slipping from the auto box and all gears are selected ok, so i'm just worried that its something on the way out.
any ideas what this is? if so, any ideas on cost?

 

[500sl]

You could check your brake light bulbs.

 

[adaptive]

ya think?

 

[landover]

Check the fan couling.It may be touching the fan when you add power

 

[Hollensen]

Could also be a leaky turbo