2020+ PCM Cooling and Heater System Draining Question

[BasaltRMK]

Hey all - quick issue that I want to confirm. My 2020 G21 has the ZZ6 engine (love it). I have the factory heater option. As I understand this closed loop system, the engine cooling and heater core are all on the 'closed loop' portion of this system - i.e., only antifreeze / coolant, no raw water. So the only thing I need to drain when it freezes again (as it does at 8,400' in CO) is pull and drain the 3 quick-connect hoses. The heater core/system does not need to be drained separately. Am I understanding this correctly? I should know this, but the dealer winterized it last year when they did a bunch of warranty work. Thanks!

[SatherG230]

That would be my understanding. While I am not familiar with your setup, our 2012 SANTE 230 has the ZR450 and the heater core is on the closed loop with the engine block. I live in MN and it is sure nice not having to drain / blow out the heater core for winterization.

[nohlan_4]

You should have all the blue plugs to pull out to winterize it and put back in and that’s it. Super easy.


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[BasaltRMK]

Thanks for the responses, guys - really appreciated! Have a great season!

[mzimmer75]

The three hoses with the quick connects plus the raw water pump and the raw water strainer bowl. I also pull the water line going to the drip less water shaft seal and blow it out with my mouth. This hose attaches to the main heat exchanger with a hose clamp.

[NautiqueJeff]

I would just pull the three quick-connect hoses, and also empty out the raw water strainer. Nothing else should be necessary.

[BasaltRMK]

Jeff and mzimmer - thanks for the additional input. I pick up the boat Thursday, so of course today woke up to snow. Should be clearing. I'll likely go with Jeff's advice, since the temps are only forecast to drop into the low 30s, so looking like we won't have another hard freeze. Time to break out the wetsuit! Thanks all.