electric fan and water pump controller

[Bryce]

I would run the pump while the engine is running unless you need to save the extra horsepower draw from the altenator...

Also I would always run an overide switch to manually turn the pump and fan on to make sure the the car doesnt overheat incase the temp sensor malfunctions. I like to have the option to turn the pump and fan on while the engine is off to cool things if neccessary.