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turbo water pump relay=control unit in disguise?

The brown relay (PN 447 965 571 A) for the elecric water pump/afterrun cooling
circuit in my 87 5kcst is bugging out, based on tests using the water pump.  I
will be replacing the relay ($45 used, but tested, at VW Parts), but my
question is, does this relay control anything else?  The parts vendor said
that the relay is actually a control unit that affects several other systems,
including idle and climate control.  This does not appear in my documentation.
Thanks for any info!