hi Sharon, thank you for authoring the winterization guide, I've used it for 2 yrs now and have found it super helpful. Living in central Canada we have some extremely cold temps so I like to pump some antifreeze into my lines while bypassing the alde hot water tank on my 2017 TAB320S. When draining the alde tank and the hot and cold drains in the rear I found it necessary to vent the lines by opening faucets to fully drain. My only concern is that my Alde tank is completely empty because the drain pail only had about 6 litres (little more than one gallon) so I'm hoping there wasn't an air lock or something...any advice on this point? Again thanks for preparing a very useful document.