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Originally Posted by stargate823
A handfull of times now I have heard "something" behind me in the engine bay spool up and run for a while and then shut off when I kill the engine. It's definately an electric noise. It almost sounds like a fan or something. What is it that's back there that would be making that sound? It's a MY2003 Boxster.
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Aside from the secondary air pump which normally goes on when you first start the car and runs for about two minutes, there is also an electric fan in the engine compartment. It's located on the passenger side, towards the front, near the passenger side air vent/scoop. The next time you hear the noise, open up the engine compartment and see if the fan is spinning. IIRC, the electric fan only goes on if the engine compartment temperature goes above a certain temp.
Regards, Maurice.