Nice car mate. Overheating issues always start with cheapest fix first if no one knows what it may be.
It has water / coolant anti freeze.
All hoses are secure and not crimped anywhere preventing water flow. (Radiator, heater etc)
Bad timing? too far retarded
Radiator cap ensure it is releasing pressure, I do not know what Golf cap is set at. An example would be 11lbs pressure. If suspect replace it.
Thermostat, does it have one? is it working replace if suspect.
I am not sure how many welsh plugs a Golf engine has need to confirm none are leaking.
Water pump?
Head gasket?
It is a process of elimination if you have no tell tale signs unfortunately
That is all I can think of ( and I am no mechanic)
Good luck with it.
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