Hi,

My Mk2 2G is leaking coolant out of its inlet manifold.

There's a coolant channel through the inlet, right? It looks like there's a plug on the driver's side of the inlet, recessed in, like a metal freeze plug you'd see on an engine. That's where the leak is coming from.

 

Can I somehow replace this part of the manifold? Or do I really need a whole new one?

Wonder if that is for auto-choke on carb models?

 

Yes hot coolant flows through metal inlet manifold. Should be easy bodge fix if you can drain and remove inlet, by using a 2 part epoxy like JBWeld or LeakFix (by PlasticPadding).

Shove it in, let it cure indoors. Fill with water, see if it drips.

Get new inlet manifold gasket. Get new coolant if it looks rusty not changed for years.

 

Maybe you can get the correct plug, but I would not know how to remove / replace.