Jet engine revving for takeoff?

[Brett Dikeman]

At 10:46 AM -0400 7/21/04, Andrew Duane wrote:
>After the 60K service on my A62.8Q, I have an interesting
>(and scary) new symptom. For about 30-60 seconds at cold start,
>the car makes a sound like a jet engine revving for takeoff.
>It's not the A/C, which was turned off, but sounds like it only
>MUCH louder and faster. It seems to be coming from around the
>air intake path. The air filter was replaced as part of the 60K.
>
>Then it shut off while backing out of my driveway, kicked on
>once again for a few seconds 300 yards down the road, and is
>now off. It never happened yesterday when the car was warm.

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?

Brett
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