Jet engine revving for takeoff?

[Sean Ford]

More than likely, you heard the auxiliary fan which runs when the AC is turned
on.  1 of 2 things was happening there; either the fan bearings are going bad
or there is a piece of trim lodged in the fan which creates stress on the motor
and you get the "air raid siren" sound. 

It's a pain in the ass, really, and all V6 equipped A6s seems to be subject to
the condition. 

--- Brett Dikeman <brett at cloud9.net> wrote:
> FYI, a A6 was parked next to me at the local icecream joint last 
> night, engine running.  The fan came on very much in a manner you 
> describe- actually sounded like it ramped up 3-4 levels, was rather 
> high-pitched, and made me instantly think of your email.
> 
> The guy then shut off the car, but when pulling out of his space 
> again, the fan ramped up quickly.
> 
> Isn't fan speed managed by the ECU in the newer cars?


=====
Sean [1999 A6 2.8q]
http://registry.audiworld.com/audiworld/registry/details.asp?car=9728


		
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