Why Do Cars Overheat? | Diagnosing The Coolant System

If you want to know how to diagnose an overheating engine/car, this is the only video you need to watch. If you haven't seen part 1, check it out here:    • Why Do Cars Overheat? | Understanding The ...   In this video, I show the coolant loop as it is in an actual car, and reference the diagram from part 1. I then demonstrate how to diagnose and check most coolant problems with your coolant system. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 0:00 Intro 0:58 Coolant System Basics 2:31 First Things To Check 4:43 How To Check Electric Radiator Fan 7:38 How Relays Work (Basic) 9:09 How To Diagnose A Bad Relay 13:17 How To Check Coolant Temp Sensor 16:10 Outro - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -