My car makes some weird loud humming sound?

Brandon

Active member
I drive a 2000 Mercury Cougar and it has done this for a while there's just nothing really that seems wrong so i just left it go but when i turn it on in the mornings when it's a little cold oustide it's fine but usually if i move it into the driveway and turn on the defroster or heat or something and i walk away it's just like HMMMMMMMMMMMMMMMMMMMMMMMMMM for like ever (about 2 minutes) and i can hear it inside my house

it doesn't do it at all when i'm driving but it does it when it's idle or i'm stopped at a stop sign but once the engine temp goes up and it's been running for a while or after school it doesn't do it?

somebody help plzz
 
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