So I'm flushing my coolant right. I have the heater on hi and the cap off tye resovior. I squeeze the hose to burp out the air. Now. How long do I have to do that for? Seems like I will never get all the air out. When I think I did. I closed the cap and turned off the heater. Then my temp gauge starts rising so I turn the heater back on and pop the cap Off and squeeze more. Now is there an easier way? A trick? When will I know all the air is out? Is the temp gauge rising bc of air pockets?