yesthatmat
Newbie
yeah this was my first go to. i get some tiny little bubbles here and there. i will try it again tho now that its had 10 hours of run time it should have any natural air outOne quick check - take the radiator cap off, fire it up, and wait until the thermostat opens. If after a few minutes you see big bubbles like it's trying to burp air out of the system, you have a leak between a combustion chamber and a coolant passage, likely a cracked cylinder.