I have now stripped 4 Sierra Cosworths and this is the first time I have come across one of these. Can't find it in the manual and had removed everthing from the engine bay before I noticed it and can't remember where the pipes went. It was hiding between the front bumper and near side inner wing dirt shield. It contained water so I assume it has a cooling function. It measures 280mm x 185mm x 20mm.
Any ideas?
Any ideas?