What's that sound?

What's that sound?
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Was the air conditioning on?
Atlas Grey A4 2.5 TDI Quattro Sport.
Mods so far: Cruise control, DIS, Heated Mirrors, Tuning box, Xenonx, Centre Arm Rest, MFSW, RNS-E, SDS and Aero Wipers.
To do: None yet.
Next: Auto dip rearview mirror and Folding Mirrors.
Mine does that (1.9) I thought it was the alternator/air-con belt?
Outside Mods: Remap, RS4 RARB, S-Line Front Bumper, Twin Exhausts w/3.5" TT tips.
Inside stuff: Auto headlights with coming home function, auto-dimming mirror/wing mirrors, cruise, iPod link, A3 8P gearknob (because it's tidier), re-trimmed interior in black.
Currently working towards: Auto wipers **DONE**, folding mirrors.
Eyes open for: S-Line door blades/'spoiler.'
A diesel running.
Can you hear it or try and locate it better with the bonnet open?
I thought he meant the hissing?
Atlas Grey A4 2.5 TDI Quattro Sport.
Mods so far: Cruise control, DIS, Heated Mirrors, Tuning box, Xenonx, Centre Arm Rest, MFSW, RNS-E, SDS and Aero Wipers.
To do: None yet.
Next: Auto dip rearview mirror and Folding Mirrors.

lol, will dig a bit deeper into this sound when the cold weather gives up on us for a bit!
Do you want £5k a month, every month, for working 3 hours a week part time ? I'm serious, open the link!
http://www.makeandsavecash.com
Boost leak? Hard to tell on a vid
it wouldnt be boosting at idle.
fan may be catching on something or air con leaking are my guesses.
2002 a4 1.9 tdi quattro avant sport in black, 191,000 miles.
yes ac would be my guess as well
recognise that noise! aircon pump.

Do you want £5k a month, every month, for working 3 hours a week part time ? I'm serious, open the link!
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it clearly sounds to me like a massy fergyson tractor! is this a competition if so what do we win! ha ha!
pumps on the n/s of the engine, run off its own 4 ribbed belt.
About a foot right behind when you show it loudest bud.
Atlas Grey A4 2.5 TDI Quattro Sport.
Mods so far: Cruise control, DIS, Heated Mirrors, Tuning box, Xenonx, Centre Arm Rest, MFSW, RNS-E, SDS and Aero Wipers.
To do: None yet.
Next: Auto dip rearview mirror and Folding Mirrors.

well it may be that the air con is at fault as when i tried the air con yesterday it did not blow cold, so, it could be a leaky air con rad as it seems to be coming from there, more news as it comes,
Do you want £5k a month, every month, for working 3 hours a week part time ? I'm serious, open the link!
http://www.makeandsavecash.com