Hey guys I have a '05 V6 hatch with 20,000 miles. Recently I've noticed that while driving, the fan in the engine bay has been changing speeds all the time, as opposed to one stable level. And after I turn off the car, the fan still runs for about 10-15 seconds before shutting off. It has never happened before and only started a couple weeks ago. My car is completely stock besides the airbox mod. Any ideas as to what's happening?