Fan belt

[Mark2]

How do you tighten the fan belt on a fiat ulysse 2.0 petrol eleganza i have looked but i can't see the adjuster

 

[s130]

Can't say for sure but if there is no visible mechanical adjustment then the engine is equired with either:

1) sprung loaded automatic tensioner OR
2) the belt is a "stretch belt" / "elastic belt"

If the belt is slipping then it is either worn, over stretched or the tensioner is worn.