Spider aux. cooling fan, How long and what temp.?

[JeffreyOlson@domain.elided]

This on a '85 Spider Graduate with A/C:

I have the factory service manual but am unable to find 
any significant reference to the aux. cooling fan in 
front of the radiator.

The car always runs 180 or cooler but occasionally the 
aux. cooling fan will run after the car is shut down for 
a very long time, like 15 minutes or more!  Once I shut 
the car down and returned over 30 minutes later to find 
the fan STILL on!  Of course this is in NC where it's 
been well over 90 during the day.

The temp sensor is mounted on the radiator cooling fan 
shroud.

Anyone know the specifications for this temperature 
switch?  I assume there is no 'after-run' timer and it 
is purely temperature-based.  Eventually the underhood 
temperature after shutdown decreases to the point where 
the fan turns off.

Of course the highest underhood temperatures are usually 
immediately after shut down but the fan run time seems 
excessive.  Anyone else had a similar experience?

Jeff
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