Odd noise from Megane Mk2 aircon?

When I first start the engine, and rev it, I get a noise from around the glovebox area that sounds like fluid rushing through pipes..... it disappears after a few seconds.

I have a feeling it's something to do with the Aircon, but not sure.

Anyone have any ideas where I can begin looking?

Thanks

Bob

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Odd noise from Megane Mk2 aircon?