It's cold outside !
The Electric Focus has a message on the dash to keep it plugged in when not used.
The Cougar is kicked out for a few weeks, she demands to be plugged in too.
I'm not sure how good the antifreeze is.
If you are concerned at all about the antifreeze and don't want to get a tester or it test bad, you will be better off dumping all the coolant out leaving it empty.
Poor kitty out in the cold! LOL