The fan keeps running after car shuts off for about another 5 mins.

What is your question?

The fan continues running or about 5 mins more after I turn off engine. It even seems lately like it is revving as we're riding. It's a 2018 saab convertible and this has just been happening for the last 6 months. The dealer repair says it is supposed to do that but it never did it before the last several months. Any ideas?