There is a fan like sound that happens randomly even when the car is turned off. It's loud enough to hear from a good distance away from the car. It also is coming from the front right side of the car
I am guessing that is the radiator cooling fan. It might run for a couple of minutes after shutting the engine off but it should not run after that.
Search Volkswagen Passat Questions
Volkswagen Passat Experts
Related Models For Sale
Used Cars For Sale