Mentioned this on aonther thred recently,I have what seem's to be the same problem,iregular rattley clattery sound which is getting gradualy worse with the air con selected 'off',it's almost elimnated with aicon selected 'ON'.tried turning steering lock to lock as mentinoed here on an eralier thred as a dignostic for the alternator pulley but no judder squelling no stranges noises in fact it elliminated the rattle for over a minute or so then it gradualy came back, just wondered if any one had proven it to be the alternater pulley, alternator is not siezed belt tention and all pulley's look fine with engine running,don't want to pay out for an A/C pump and find it's not,