Take the cap off of the reservoir and squeeze the line coming from the rear coolers a few times until you don't get bubbles in the reservoir anymore, this will help get it out. Raise front of sled a couple of feet off and start up and run until the rear coolers (both sides) get warm. Lower front raise rear and run for a few minutes. Repeat this a couple of times and you should be in good shape. If you do a search on hear there are numerous threads on this subject that should help you out! Just make sure you are thorough. Good luck.