Squeaking auxiliary belt

[Ianrumos]

Hey guys I'm new here.. Just wondering if anyone can advise.. 

I had a squeaking aux belt..I've changed the tensioner pulley but still has a squeak.. If I sprey with wd40 the squeak goes away for a few mins 

[cliffcoggin]

Clean the oil off the pulleys and fit a new belt. Belts rely on friction to transmit drive so it makes no sense to spray oil on it.

[Magnet]

Welcome Ian,

Bear in mind it maybe any other component driven by the auxiliary belt.

Kind regards,

Gareth.