Fan Noisy

Hi 96 contour 2.5 ,once in a while gets hot ,other day wife said temp got hot and stalled ,started back up and has been fine for couple of days only cooling fans make loud noise like a truck,cant tell which fan or both.Fan seems turning faster than normal.Any ideas.

probably this.

http://www.contour.org/FAQ/FAQ.php?s=probs&displayid=23