A31 cefiro cooling system

[A31cefiroNZ]

Hi ther have an r32 rb20det engine, now have a hose running under intake and beside thermostat have plugged in the long hose running from firewall side, also plumbed the smaller port which was under it, as old engine was like that, now back toward the firewall have plugged I the shorter hose from firewall side, but am left with another plug that is a coolant/water hose, just wanting to get an idea of what it could be and where to plug it, will upload photos, cheers heaps team 🤘