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The cooling fan should come on after the thermostat opens but before the engine overheats.
The coolant fan will be "ON" when:
The coolant fan will be "ON" regardless of vehicle speed when:
The coolant fans may remain "ON" up to 7 minutes after engine has been shut "OFF."
Fan won't come on after vehicle is turned off. It will stay on once it is activated when running.
You need to check Temperature prior to shuting it off, to be sure it is above 223.Also, if you have a voltage meter, check to see if Temperature Sender is sending signal to Fan Relay
Overflow can be caused from pressure in the system (Exhaust), bad Radiator Cap, Thermostat stuck or closed, etc.
way to go...
Thanks for the update