You don't have to, I don't know what model you have but all use self tensioning belt drive systems. This is a spring loaded pulley which holds the correct tension. if you have noise or slipping you either have miss routed the belt, part failure, old belt.
theres no way to tighten it you will have to buy a new belt
with the automatic belt tensioner..
the belt tensioner does it by itself.short answer no
The belt is tightened with an adjusting screw.
go to a mechanic
the belt is automatically tensioned by a spring loaded tensioner.
The fans are electric and do not have a belt The fans are electric and do not have a belt The fans are electric and do not have a belt
The belt is tightened automatically by the belt tensioner. If the belt is too loose, it's time to replace it.
Loosen alternator remove old belt. Reroute new belt, tighten alternator.
usually serpentine belts get their tension(tightness) from the belt tensioner
The fan is electric, not belt driven. The serpentine belt is has a spring loaded tensioner. If the belt is loose, the tensioner has failed.
You'll probably want a manual for this, but you may be able to locate a bracket on or near the alternator that moves the alternator itself or a pulley that the belt runs on. This is a tensioner and turning the bolt one way or the other will tighten or loosen the belt. DO NOT OVER-TIGHTEN THE BELT! This will damage the components the belt runs on.