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"Keeping the fan running after shutting down will have zero affect on it."
Not quite. The thermostat stays open as long as the engine is hot, and supposedly the heat coming off the block creates a 'thermosiphon' action which will create a little flow. In fact some very old engines (antique tractrs, etc) don't have a water pump at all, and their only coolant flow is through a thermosiphon action.
My PV used to boil over fairly frequently prior to installing the fan. Now if you park it hot the fan will cycle once or twice over about 5 minutes and I haven't had a noticable boilover since. It still has the open dump tube - I need to convert it to use an overflow bottle sometime.
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I'm JohnMc, and I approved this message.
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