It is controlled with a thermostatic switch. As long as the radiator is
hot it will operate until the switch neutralizes, That sometimes takes a
while because heat keeps coming up into the radiator.
IE Heat rises even in antifreeze or water and the radiator is higher than
the block, the engine thermostat also neutralizes and then the heat flow
should stop.
Even on new BMW or Mercedes with electric radiator fans, they run after
the engine is off.

Stan Wilder

On Sat, 30 Mar 2002 20:34:32 -0800 Tom Salicos <TomSalicos@ATTBI.COM>
writes:
> > My question is... When the car is off, and the front fan goes on,
> and
> often
> > stays on (in my '91 Golf it will stay on for 15 minutes sometimes)
> what is
> > this actually doing??
>
> I thought this was the case of  uncooled water in the radiator
> heating the
> fan switch back up after the air stops flowing over it.  So it stays
> on
> until the water in the radiator (and the switch) cools back down.  I
> didn't
> think it was designed to do this, just does it.
>
> Tom Salicos
>

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