Also check for a pinhole leak in the radiator top hose and around the thermostat housing.
With correct coolant strength, there should be dried, white crystallised residue from the leak source.
I'll admit that the coolant pump is unlikely because of the journey the coolant would need to make to where it is gathering but given the unusual location of the problem, just check all bases.
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2002 S60 SE D5 Manual
209000 miles
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