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On the early Boxster's, the radiator fan speed was controlled by resistors in the circuits, which were mounted on the radiators themselves. As these were prone to fail over time, Porsche later switched to pulse width modulated fan motors, which eliminated the resistors, but when the PWM fails, you need to get an entire fan assembly.
Yours should be the resistor type.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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