Heater - Raw or Fresh?

[DJH]

I have a 2011 230 Coastal Edition with a 409 Catanium engine. As far as I am aware the heater is on the fresh water loop, not the raw water loop. The dealer told me it's on the raw water side... this doesn't make sense to me but I can't find a specific description/diagram in the manual. Can anyone clarify this? Thanks.

[AirTool]

I can see benefits for both methods. Did you check the pcm parts guide. The exploded views show the path....not sure if coastal version is unique.

Here might be an easy way to tell. Get the engine fully up to temp...all the way hot so the pressure has built up not just the stat opening. Then kill the engine for safety and squeeze your heater hose. If it is hard then coolant. If it is soft then fresh.

[DanielC]

Where do the two heater hoses hook up to the engine or cooling system?

Go look. Do not take anyones word on it.

[Quinner]

Would hope it was on the fresh/coolant side as that should produce the best heat and would also be one less thing you need to winterize not to mention the effects salt would have on the core assuming you are running in salt.

[DJH]

Quinner - my thought exactly, that's why his answer suprised me.

Thanks for the responses guys - the boat's back at the dealer getting a couple things squared away but I'll have it back in a week or so and will trace the hoses.

[DJH]

It's fresh

I've got the boat back and confirmed the heater line comes from a T right outside the block... the heater is on the coolant side. I also brought the topic back up with the dealer - they'd done a little more research and confirmed they were mistaken when they said it was on the raw side.