I had a very annoying squeak/screech with my serpentine belt when I bought the vehicle 18 months ago, the tensioner had been replaced about a month before I bought it, but had old belt, so first thing I did was change to a new belt (Gates) and it was even worse :mad:, so bought a Dayco upon recommendation, which was no better.
I read on one of the UK LR sites that the tensioner pulley manufacturing tolerances can be such that it does not run true - the way to solve is a 5c coin behind the tensioner where is sits against the block, at the 9 o'clock position as you look at it from the front of the vehicle. Haven't heard a peep out of it since. Might be worth a look for anyone with persistent problems.
DB, in regards to the rough backed belt,
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is it a Lemforder belt by any chance?
I have heard they are very good at staying quiet due to the rough backing instead of shiny.
Seano