Any have any ideas how to make a belt stop slipping? It only happens when I first start the car and it is really bad when it is raining or really humid out. I had someon go in and clean the belt (even though it's brand new) but it still seems to squeek. The belt it pretty tight but I am not sure how much to actually tighten it as it used to have a tensioner but, not, with the s/c, I have to manually do it. Any suggestions?

Simply replace the belt with a new one and/or spray some belt dressing (sold at all auto part stores) on it!!!