If it's not the thermostat housing, the fan, the water pump, the filler cap or an airlock … it MIGHT be the radiator (the plastic elbows get brittle over time), an inlet manifold gasket (the escaping water tends to sneak away following the contours of the engine so you don't notice it) or any one of your hoses, hidden away as a lot of them are under loads of other stuff.
Apart from that the cooling system on these hardly ever goes wrong.
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Conformity is not morality.
Consensus is not truth.
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