Understand the Overheating Issue and Solution

What happens here

The video begins with the creator introducing a white Chevrolet Corvette C4 that was acquired for $500 and subsequently sold for $2000 after a simple repair. He explains that the car was overheating due to air pockets trapped in its cooling system. The primary tool for this repair, a specialized coolant bleeding funnel, is introduced as the solution.

Goal: Identify the cause of overheating and the primary tool for repair