Vauxhall combo 1700di - How to remove fanbelt - Tommk4
I'm having some trouble removing the fanbelt on my combo van. The chap in the garage said I just need to loosen the nut on the tensioner and it will come off. It sounded easy, but now i've got it home I loosen the nut and it does nothing! In-fact I can take it out completely and still the belt remains too tight to remove...What am I doing wrong?

PS Im not just loosening the wrong nut. Its definitely the tensioner as it moves when i pull the belt tight.
Vauxhall combo 1700di - How to remove fanbelt - engineMtech

put the bolt back in, do it up then try doing it up even more, this will swing the whole tensioner arm away from the belt it is called a self tensioner or automatic tensioner.