For some reason my fan goes on and off about every 10 seconds or less. Every once in a while it will stay on after I turn my jeep off, and it usually stays on for atleast two minutes. This summer I got my radiator flushed and whole cooling system up to date, and I can't figure out why my this is happening. Anybody know?

 

Its running when you have your defrost on.. it is tied to your AC pump that sucks moisture out of the air to help defrost.. its annoying but its the way its supposed to work.. when you switch it to just heat it should stop.. some people get tired enough of it that they put in an inline manual switch.. just need to make sure you dont overheat when it warms up..