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Hey Bobtail,
Aren't those just afterrun pumps? I think they just run for a short time after the car is shut down to aid in heat removal from the bearing housing on the turbo section. They were to aid in thermosiphoning (sp?) to keep coking away.
The Most Audi turbocharged cars use them, Volkswagen (post 98) turbocharged cars with the TDI models starting in 99 or 2000. The VR6 Volkswagen models also had them because those motors ran HOT! They were designed that way, but they didn't want heat soak after shutdown.
Check it out folks.
Kev
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