Funny noise, 2000 A6 2.7tt

[Brad Wilson]

Upon startup, my A6 has taken to making what sounds like a interrupted
"honking" noise... it sounds like a cross between a goose and the car alarm
horn. It doesn't last long (maybe 30 seconds at most), and it only does it
when it's cold (when you start the car hot, it's quiet).

Any clues what this might be, before I end up taking it to the monkey lads
at my dealership (not what I want to do)?

Thanks in advance...

Best regards,
Brad

2000 A6 2.7 biturbo quattro   http://www.quality.nu/bradw/audi/
2 turbos, 1 driver ... no limits