We recently had a situation where we lost a good amount of coolant due to an improperly installed overflow cap. We have been adding coolant over the past few days, and are slowly building the level back. Is there a trick to expedite this procedure, vs how we are doing it? I saw a post regarding a snap-on tool...does that apply here too, or just when you tear the motor down and are filling the entire system? Why/what has to be bled? Where does the air get trapped?