To understand a cooling fan that runs after the engine is switched off, compare it under normal, safe conditions: cold versus warm, idle versus steady speed, and light versus higher load. Record how long it runs, recent driving conditions, and whether the engine temperature was high. Change one condition at a time so the result stays useful.
Do not create a risky test just to reproduce it. Check the manual because some vehicles intentionally run the fan briefly; keep clear of it even when parked.
Quick educational note
For information, not a diagnosis or repair instruction. Vehicle-specific checks are still required. Consult the manufacturer's guidance and a qualified technician.
How to use this information
This article explains general principles and does not establish what is wrong with your vehicle. Read the content limitations.