Winterizing 2015 450hp in a G21

[seachicken27]

About to winterize my boat and I'm sure this has been discussed at length, but I have a 2015 G21 with the 450. Is the heater closed cooled? Or do I need to drain it? Also, I can't find my diagram showing where all the raw water drains are. Can someone help me out?

[NautiqueJeff]

Heater should be closed-cooled.

[GMLIII]

Jeff would the location on the drains for the H6 450 be the same as the diagram for the ZR 450 you noted above?

[Infinity]

GMLIII I am not sure about drain locations....but did read that the H5 and H6 heaters are raw water cooled and have to be drained and blown out. You probably know this, just figured I would throw it out there since ZR409 & ZR450 are closed like Jeff mentioned.

also...here is link to manual for PCM engines

http://pcmengines.com/owners/

[NautiqueJeff]

All of the manuals are right here on this site. We have more than what PCM has on their site.

Manuals / Brochures

On the H5/H6, they will all have the blue plugs and are super easy to drain. Takes all of five minutes. The only thing that doesn't have a plug is the heater, and that just requires disconnecting the two red hoses and introducing air pressure into either one to force the water out of the other.

Here are the drain locations for the H5 and H6 (NON-Coastal):







Here are the drain locations for the H5 and H6 (Coastal):

[GMLIII]

Infinity since I have a Coastal Edition my heater is a closed system therefore I do not need to drain. Jeff thanks for clarifying Coastal vs Non Coastal drain locations. PCM manual does not make that difference very clear

[NautiqueJeff]

You're right, they don't. And yes, I would assume with the closed-cooled H6, your heater should be included in the closed system with no need to drain.