If using real anti-freeze, I would leave it in,,, I use the pink stuff and drain it. It will get slushy and the -50 designates the temp it would take for it to burst a copper pipe if un-diluted.

Oh, come on Rippem! That was a joke...at least I took it that way.

I like cats. Except ones left over from old girlfriends....

Many years ago guys...