Heat Exchanger - Winterization of a Coastal Edition H6 - 2017

[GMLIII]

I realize some members are probably wondering why the heck I'm I asking a winterization question in April, but I'm thinking of doing my own winterization of my Coastal Edition H6 this winter. I have good information of the location of the drain plugs on the H6 and have validation that I do not have to drain my heater because it has antifreeze in the lines vs water. My question is since my boat has drain plugs for the engine is there any reason to drain the actual Heat Exchanger plug on the Coastal Edition H6's. I can't find any information telling me to drain the Heat Exchanger plug and all that is required is to drain the drain plugs on the engine. Can someone validate whether I'm correct or off base.

[Infinity]

I realize some members are probably wondering why the heck I'm I asking a winterization question in April, but I'm thinking of doing my own winterization of my Coastal Edition H6 this winter. I have good information of the location of the drain plugs on the H6 and have validation that I do not have to drain my heater because it has antifreeze in the lines vs water. My question is since my boat has drain plugs for the engine is there any reason to drain the actual Heat Exchanger plug on the Coastal Edition H6's. I can't find any information telling me to drain the Heat Exchanger plug and all that is required is to drain the drain plugs on the engine. Can someone validate whether I'm correct or off base.

Least on my engine...there is a plug for coolant on heat exchanger AND a plug for fresh water which does need to be drained to winterize. I have not worked on H6 tho, so not sure if the same. Should have a breakdown in the manual which tells how many plugs and where.
I always suck up AF tho to cover any little mistakes...and after removing each plug to drain water, put a shop vac on holes which always pulls out more water than simple drain with zero suction. After sucking up AF, then I remove impeller.

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[GMLIII]

Least on my engine...there is a plug for coolant on heat exchanger AND a plug for fresh water which does need to be drained to winterize. I have not worked on H6 tho, so not sure if the same. Should have a breakdown in the manual which tells how many plugs and where.
I always suck up AF tho to cover any little mistakes...and after removing each plug to drain water, put a shop vac on holes which always pulls out more water than simple drain with zero suction. After sucking up AF, then I remove impeller.

Sent from my SM-G930V using Tapatalk

Yeah what I'm hoping to hear is when I drain all the plugs on the engine hopefully the heat exchanger water somehow gets dispersed to these engine drains. Nothing in the manual is telling me to drain the water out of the heat exchanger on my Coastal Edition. Hopefully a Coastal Edition owner will chime in to validate my concern.