Does anyone know if such a fan would be running on some sort of timer or if it deactivates after the engine compartment reaches a certain temperature? I am also wondering about the purpose of the fan. I heard that it sucks the fuel vapors from the engine compartment in order to prevent fires. I also heard that it cools down the engine compartment. There is no documentation of this fan in the owner's manual and the local dealer service does not seem to know the answers to my questions.
Thanks for your help,
I will say; With a Gasoline engine it probably for exhaust of fumes. Normally turned on manually with a switch 5-10 minutes before starting the engine.
With a Diesel it a Cooling Fan for the engine room. True, in a Sailboat of your size it not a big engine room, but, technically, it is a room!
My Brother's Motor Boat is Humongous!!!! 75 feet! I think the Beam is 12? Maybe 14? The Engine room and this IS a room! Has Twin Cummings and the Stacks sticking up have Humongous cooling fans inside!!! There some BIG stuff on this boat.
I can guess there smaller versions on smaller boats.
If it Gasoline/Petrol? This a Venting fan, should have a switch, but, over time someone may have hard wired to run constant thinking it more safe!
You have to learn how other people think. It not stupid, just this how that person felt, to be more safe!
If, it Diesel, I will assume it just a Hard Wire to run constant. Though I have seen elaborate hook-ups to cut on/off at different temperatures.
All I know is when I been down in what I call an Engine Room (Be it Power or Sailboat) ; It one Hot S.O.B. and after 12 hours running and 8 hours sitting, it still seem hot to me!