Help please the vrs is new to me, In between the expansion bottle and the screen wash reservoir there is a black squarish shaped reservoir with a power lead and 2 pipes coming out of it, what is it and what does it do, should it be tapping like noises tappet on an engine? Thanks in advance

Charcoal canister and yes it does click / tap.

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Edited 1 April, 201412 yr by mluton

Perfectly normal. Dont worry about it

Thanks for the help ;-)