I'm pretty sure I've done it without draining the coolant but it was a very tight fit turning it this way and that to get it to come out. Just definitely pull the battery cables or you'll be welding stuff as you pull it out.
![Shocking!! :shocking:](https://board.marlincrawler.com/Smileys/marlin/shocking.gif)
It may be easier to drain the coolant though.
![I Dunno... :dunno:](https://board.marlincrawler.com/Smileys/marlin/dunno.gif)