today was a wicked bad sonow day and didn't hear it in the morning but after class i had the car stated from my class and when i came to my car i heard a somewhat loud sound. well actually it sounded more like a metal tapping sound first i thought my engine was going to crap out, i opened the hood and sounded like it was cumming from by the alternator. but when i switch the heater off it went away and the car was quit with the engine running as usual. but i had the heater on coz it was clod the car ran fine and after the engine got hot it went away. is it something i should be worried about?

 

yea...i think mine does this too when its really cold. Almost like the blower fan is off axis a bit. been too cold to mess with it but ill investigate once its gets nicer (of course by then i wont be using it!)

 

found the problem, its one of those fans behind the radiator guess its bearing is worn out or something