Combustion Air Fan
WARNING: This page is about a different car, the 2020 Jaguar XE and 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
The combustion air fan regulates the flow of air to the heater so as to ensure correct combustion. If the heater is operational while the engine is stopped or the heater enters the control idle phase, the air fan will continue to run in order to cool the combustion chamber in readiness for the next required start. The operation of the fan may be noticed during this process. This is perfectly normal.