so for about 2 weeks my fan(s) were making a loud sound that i could hear whilst driving.... and from some threads that i read it was normal. my fan(s) would actually run for about 2-3 seconds when i turn off the car. and i thought it was normal

My discovery/opinion
i replaced my fan module about 2months back, so when i heard the loud sound i thought it was normal since the weather was changing.
this weekend for some reason i decided to open my hood whilst the car was running to my surprise the top fan was not working, it was the lower one that was doing all the work. i checked the plug from the fan module to the top fan and it was loose and i pushed it back in and the top fan was spinning and spinning (I SWITCHED OFF THE CAR FIRST). i do not hear that loud sound anymore and my fans don't seem to be running after i switch off the engine. i am now thinking that guys who hear a loud sound whilst their fans are on should check if everything is ok.....MY OPINION