28 Essex Coolant
When changing the coolant on an Essex Super Six do I have to worry about introducing air into the system? Or can I simply drain the coolant and poor the new coolant in? Also, the spec sheet says it holds 4 3/4 gallons, but it only accepted 4 1/4 before it reached just below the cap. Should I fill it all the way to the cap? Should the tube at the top be submerged?