As suggested check the small right angle plastic union with narrow bore hose attached which fits into left hand top side of radiator, shown removed below.

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If it's all dry around there though it's probably leaking from the bottom of rad where the plastic side tank interfaces with aluminium core - see below

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Mulfab all aluminium replacement here. Old rad can be slid down after removing hoses and fixings by lifting off cowl and fan. This latter item is re-used on new rad. Best if car on ramp or well jacked up at front though.


Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone