It sounds like you've turned off the engine while a DPF regen was in progress. As this creates much higher temperatures than normal in the engine bay the radiator cooling fan is turned up to 11.
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MY17 XC90 D5 Powerpulse Momentum: SENSUS, Osmium Grey, Blond, Walnut, Xenium, BLIS + CTA & RCM, Winter Plus, Fuel-fired Heater, Heated Rear Seats, Power Extensions, Tinted Windows
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