Originally Posted by Muddy
What exaclty do the low point drain valves do--it may sound silly, but they dont look like they actually drain??? I have a 2017 Int Grand Tour and I blow out all lines with air, add rv antifreeze and run through all systems very generously--do you think it important to open them and blow the system again? While my process worked great last year--I want to take no chances and believe in overkill to protect the water systems!! Mike "muddy" Waters
Have you opened the drain valves and then opened the galley or bath faucet? If the drain valves are open the water in line will drain out. If you don't open another faucet in van water remains trapped in lines.
Since it does not freeze very hard in your area it might not be critical to get all the water out of lines, but there is always some risk of creating a leak in the water lines if any water is trapped and freezes.
By adding RV antifreeze to the lines you have certainly mitigated any risk.
I personally also blow out the lines fully and open the drain valves. Then I only add a small amount of RV antifreeze, just at the water pump, to avoid having to flush out a lot of antifreeze when I restart the water systems.