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if you are referring to engine coolant fan, it probably need to be replaced. The fan runs for a short time after engine is shut off of coolant temp is high.
it can run hot with cap off due to the pressure needed to open the thermostat, but it would take about 20-30 minutes for it to run hot. if engine is running hot really fast, check for stuck thermostat or blown headgasket. also check the cooling fans operation.
most fans are clutch fans and they work or are engaged by temp.most all will spin under really cold conditions.this is normal.but to be sure, with the motor off and key in your pocket grab the fan and see if it wiggles or has any slop. if not alls good
Having the fan run on for a bit after the engine has stopped is not abnormal in itself, but 20 minutes sounds excessive.
If the fan does eventually shut off, I'd consider changing the thermoswitch (this is a sensor screwed into the radiator somewhere near the bottom, with a pair of wires connected to it - to change it, you'll need to drain the cooling system).
If the fan stays on continuously until the battery is completely flat, see what happens when you unplug the wires from the thermoswitch. If this stops the fan, you need to replace the thermoswitch. If it doesn't, then you need to examine the wiring associated with the switch and the fan, looking for damaged insulation.
If the vehicle has a clutch fan, verses an electric fan, sometimes the clutch will spin the fan too fast or at erratic speeds. I'm not saying that's what it is, but just one possible reason. Seeing how you have the warrany, I would take it in and not leave until they have remedied the problem. Let us know how everything turns out and good luck.
If no engine lights are coming on, and the dealership has diagnosed it normal, I wouldn't worry. Electric fans may stay on even after the car is shut off to help cool the engine. Usually there is a warning in the engine bay stating this.
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