Anyone know what this pipe in engine is for? 2007 a3 s line

Staceyf

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Hi

Apologies I'm new to this I'm not sure how to upload a photo but does anyone know what the pipe that comes out of the left hand side of the engine cover and goes down the back just kind of next to / past the water pump I know that's not a very good description and I can't upload a pic but it is making like a rattling sound when idelling in the car only, can't hear it with the door / windows open, and stops on accelation and when the bonnet is open If someone pushes that pipe down the rattling inside the car stops, im trying to work out what the pipe is before know if need to take to garage any help much appricated thanks

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