remove radiator overflow tank on holden VY11

Your car isn't covered in our repair reference. However, in most cars, there will be 1 or 2 hoses to and from the overflow bottle. You will need to look for anywhere between 1 and 4 bolts securing the bottle to the inner fenderwell. USUALLY, on cars available in the US, if there are 2 bolts, the back side of the bottle will have an attachment which slides into a bracket on the fender. More than 2 bolts usually means no sliding bracket.

I am fairly sure that they drop out from below, remove the front inner plastic guard cover, i am fairly sure that they will come out here.