Whooshing vacuum noise?

[CycleSi]

Since I have put the rear seats down in my B7 saloon to fit my bike in, I can hear a "whooshing" type noise like a vacuum or pump. I can't explain it very well, but it is coming from the back of the car and I haven't heard it before - only since the seats have been down.

Is it something to do with the suspension?

I'm more intrigued than concerned.

Thanks.

[RichieRS]

Something to do with the exhaust valves? (vacuum operated).

[CycleSi]

It happens constantly whilst driving.

If it were the exhaust valves I would have thought it would only be when l hit the Sport button and it would do it the once?

[NJMAudiRS4]

Does it do it when stationary? If so then possibly a vac leak.
Does it do it only when moving ? If so then check the boot floor for any missing grommets as a possibility. Is it the fuel pump making the noise. Any damaged seals around Windows or boot area.

Hope it's some thing simple

[Stazza80]

Hi,

It might not be anything bad, on previous cars (r26 & m3) I had a similar noise with the seats down, actually sounded quite good. Amazing how much noise the seats hide from the boot area!

Ben

[Dolphie]

Si,

The vacuum reservoir/solenoid valve is in the boot (I'm sure someone will correct me with the correct term). It's the blue thing that looks like 3 tennis ball spheres joined together.

I had the boot of my avant stripped out for some work and I could hear the type of noise you describe very clearly. I'm guessing the rear seats also help suppress the noise and that is why you are aware of it.

[CycleSi]

Yep; I think that is exactly it - the noise is to do with the vacuum system. With the seats back up it's silent again.

Thanks for all of your replies