This is why you just do a little at a time . the car won't die. Remember I'm not telling you to pull the heads but I'm just saying the only realistic way is to pull heads if you wanted ALL carbon out.

And don't forget the trans pan magnet!!

As far as coolers go, people use tep to support our community. But a rv sized trans cooler in the bar plate variety will do the trick there like 60bucks on amazon