Has anyone experienced seawater entry into the engine compartment via the air vents. I have water in some of the air vents obviously entering from the aft exit of the vents under the vent cover.
Not happened to us, even though we've had seas break on that part.
Are you sure water is entering through air blower vents? Have you checked that they are caulked into the hull securely?
We have had saltwater in engine compartment through the air valve on top of grey vented loop of raw water hose. If this one-way air valve gets clogged then engine raw water pump causes water to flow through valve and down black rubber breather hose into engine compartment. Only while engine is running. Easily fixed by removing and cleaning the valve on top of the loop.