My 2004 ford freestar belt squeeles and sometimes kills the van.tried the spray and doesn't work?

My 2004 ford freestar belt squeeles and sometimes kills the van.tried the spray and doesn't work?

Then the belt needs to be adjusted or replaced.

Under normal conditions a squealing belt is a sign of one of three things, glazing on the surface of one of the pulleys, a stretched belt or a weak tensioner. Depending on the mileage on the belt the easiest fix is a replacement or one or both.