Thats the AE86 water arrangement above, if i remember correctly the outlet on the back provides a bypass thingy (technical term
) and allows water to circulate around the engine before the the thermostat opens to avoid hot spots around the cylinders, should be a piece of solid pipe running down the side of the engine.
The other outlet on the rear is the flow to the heater matrix which can just be looped the return for the matrix.
Cant remember where those 2 small front ones go, sorry.
I hope this helps
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