Many car owners are convinced that after driving a car with a turbo engine, the engine needs to idle for a while. If you shut off the turbo engine, the impeller will continue to rotate by inertia for a while, but will not be lubricated by oil, and this can lead to a number of failures due to uneven thermal expansion.
Basically, it is necessary to let the atmospheric unit idle as well, because otherwise you will provoke accelerated degradation of the engine oil. Stopped pump will not pump coolant and antifreeze will stop circulating through the system. The oil that has settled on the rubbing parts in such case will experience local overheating, i.e. it will start to stick. This results in deposits on the working surfaces and activates the process of coking of the system, whereby the deposits literally stick to everything in the cylinder.
The risk of overheating allows loosening the electric fan of cooling system, which is installed almost on all modern cars. It works even when the engine is switched off. However, few people know that in many automobile manuals it is described, that it is forbidden to switch off the engine with the switched on fan not only when driving, but also when stopping.