Squeaky Belt

[Viperz888]

Hi guys, I'm getting a nasty squeaking, chirping sound from my auxiliary belt since the water pump was changed. It is the same belt, as it is in fairly good condition.
Where do I start looking to resolve this, as parts are expensive for the car (2003 Mercedes CL500).
Thanks

[Richyvrlimited]

Tighten it?

[andyiley]

If that is not the problem first ensure it is that belt & that pulley by precisely dribbling/squirting water at the individual pulleys & belts. When yiou hit the one causing the issue the noise will stop.

at this point it may highlight that one of the pulleys is a bit "shiny" & a bit of a clean up with emery cloth will help, otherwise it may highlight a bearing that is actually the problem.