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I have had two coolant leaks on our 98 S90 that were difficult to track down. One was the blue/green coolant cap. It never showed signs of leaking but the coolant reservoir would get lower and lower. The cap was cheap, I bought an exact replacement at NAPA and it solved that problem. The other was a heater hose clamp that was seeping behind the head on the passenger's side. It was difficult to see but that leaked without being seen as well.
A pressurized radiator could be as simple as a bad rad cap.
DEWFPO
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1998 S90 088,900 and 1995 964 154,100
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