Service function guideOverheating Engine Diagnosis

This service function walks a working mechanic through a complete, methodical overheating engine diagnosis, starting with how the cooling system moves heat and ending with a verified repair and a road test that proves the fix. It is written for technicians who already understand basic engine operation but need a repeatable sequence that avoids guesswork and comebacks. You will learn to confirm the complaint, pressure-test the system cold and hot, test the thermostat and fan controls, check for combustion gases in the coolant, and interpret the results before condemning parts. By the end you will be able to isolate a root cause, document your findings, and hand back a vehicle that holds temperature under load.