Why is it important to be sure that there is no air in the system?

It is crucial to ensure there is no air in the system because air can lead to decreased efficiency, reduced performance, and potential damage to equipment. In hydraulic systems, trapped air can cause sponginess, erratic movement, and even system failure. In cooling systems, air pockets can impede fluid flow, leading to overheating. Overall, removing air helps maintain optimal operation and prolongs the lifespan of the system.