Trust me with that many miles your fine-first off if your coolant level is fine or full there isnt any air in the system-remember these are pressurized systems just like your car-if your coolant hasnt dropped its level your good to go,on the other hand,if your coolant level starts to drop and you have to add start looking for leaks-plain and simple your not going to have any air in the system with over 100 miles!!!!!!!!!!!