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Old 07-15-2016, 06:04 AM   #1
Join Date: Mar 2016
Posts: 80
Winterizing a Concord 300DS

I know it's early yet but I want to be prepared. I have a 2016 Concord 300DS and am planning for my fall winterizing. Up here in Minnesota that may come in late October. In the past I have always used a three way valve at the water pump to accomplish this. On this unit there is an external fill connection for fresh water filling. If I put in the three way valve at the water pump can I just blow out the fresh water line from the outside and be confident that's clear? Then I can fill from the pump with antifreeze. my other option is to buy a pump and connect to the outside fill and pump antifreeze right from there. Thoughts?

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Old 07-15-2016, 05:14 PM   #2
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Join Date: Feb 2016
Location: Sprung Leak, NC
Posts: 570
Dunno... I will have to look into it. We typically don't winterize down here until around Thanksgiving, if we even do it then.

I am pretty sure that you use that valve gizmo, just haven't figured it out yet. Dealer didn't cover that and I forgot to ask. I am used to the old style system where we blew the lines using the city water fill.


Aaron & Rhonda
wahoonc & Airangel60

2016 Coachmen Concord 300DS
2015 Fusion Hybrid following along
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Old 07-15-2016, 10:22 PM   #3
Join Date: Mar 2016
Posts: 80
Thanks Aaron. I never trusted just blowing the lines out for fear of some water staying in the lines and at -30 it could be trouble. I think the safest would be to get a second water pump and pump antifreeze through the city water connection but I'm not sure where the check valve is in the system and need to protect the water pump too. I'm still thinking on it.

By the way, I decided to put a 3/8" PVC valve in the fresh water tank line to dump the fresh water faster. Works much faster than the "T" valve behind the return air cover. And, I put magnet catches on the return air cover to make it easier to get in there. Had to plane the cover down a bit to make an easier slide fit.

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winter, winterize

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