well tonight i was driving and i turned the heat up on blast...now before i go any further....about 3 months ago my A/C fan started making a weird noise kinda like a grinding noise and on low it was quiet but as i turned the fan higher the noise would get louder....it sound like a motor but i have no clue what it was but i never got it checked out so like i was saying before tonight i turned the heat on blast and all of a sudden this strong burning smell came from the vents so i turned it off.....it smelled like a burnt vaccum belt..... so i turned the heat off for a bit then i turned it on low again and the smell was no longer there.......does anyone know what this is or has this happened to anyone else????? PLEASE HELP