what makes the belt squeal when you start the car, only for a few seconds . on 2002 Hyundai Elantra

the belts ( three ) are all new, They sqealed before I replaced them, then they stoped for a short while when they were new, but now they squeal again when the car frist starts up.

Asked by for the 2002 Hyundai Elantra
Are the fan belts properly tensioned (not loose) make sure the pulleys are all properly aligned and the pulleys and belts have no oil or coolant contamination. If the fan belts use an automatic spring loaded belt tensioner perhaps it is failing.
pullys look straight, they are new clean belts, ( doesn't have a auto tensioner )
I thought I properly tighened them , but I guess I'll try to make them tighter