My boat has the Eberspacher D5 diesel heater...which does not work.

I got to thinking about it since lately it would be great to have the "fresh air ventilation" setting functional so we could circulate fresh air from outside to inside.  This is especially needed during nights with little breeze to bring the cool evening air down below.

Before I go to the trouble of trying to figure out what's wrong with it, does anyone use it for fresh air ventilation?  Does it help reduce the temperature in the boat when the outside air temp is lower than inside?  i.e., does it move enough air to be helpful?

The other approach I'm considering is to mount a fan on the aft cabin hatch to exhaust air from the boat.  24 volt fans meant to cool the radiator on semi trucks are available and have sealed motors.  I'm sure there are other ways to skin the cat...any suggestions?

Thanks,

Duane

Wanderer SM#477