You need to take the car for a drive of some duration... enough for it to thoroughly come up to temperature.
If no cel appears, consider it a one-time glitch.
The engine compartment fan is linked to the DME and would not in itself cause any issues for the motor. The radiator cooling fans is another story. You can also try bleeding the system by opening the coolant bleed valve and run the car, top up as necessary.
Check all relevant fuses and relays to make sure these aren't causing an issue.
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