Peugeot 405 19td - andy m 407 - andy m 407

engine has a squeak that sounds like auxillary belt have changed all tensioners and the noise is still there it only does it when engine is cold when engine is warm it goes i suspect crankshaft pulley has anyone got any ideas thanks

Peugeot 405 19td - andy m 407 - hardway

Wouldn't be the first one I've renewed,

they are a steel/rubber composite after all.

Peugeot 405 19td - andy m 407 - Railroad.

I've replaced them too. Another possibility could be the clutch release bearing. Eliminate that by disconnecting the clutch cable and move the release fork back. If the noise disappears then the release bearing is the problem. If it doesn't then it isn't.