Logically it sounds like a fan or fans. Could be the fan motor starts wailing only when it is hot. Perhaps jumper the fans and let them run with the car stationary and see if you get a noise after a certain time.
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Grant
Arctic Silver 2000 Boxster S - bought with a broken engine, back on the road with the engine replaced
Green 2000 Boxster 5-speed and 1978 928 auto
1987 924S 5-speed (Sold) - Blue 2000 Boxster 5 spd (Sold)
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