Different propulsion cooling sounds?

Had to run the REX today and when parking the car noticed the cooling system sound was different from a previous session.
The sound was more like a large fan running at a rather high speed to cool.

On a different occasion, I think I had the car preconditioning which was making more of a air compressor sound. Anyone know the what the car is doing differently? Is one for battery a/c cooling, the other for the REX engine cooling? Interesting because it runs while the car is "off".

Mike

Probably the cooling fan for the coolant radiator and A/C condenser in the front. Like many ICE vehicles, a similar cooling fan can continue running after the vehicle is shut down if the coolant temperature is above a certain threshold.