Hi  
On L Escort TD 1.8, there is a 'screeching' noise from the turbo area (drivers side) when I reach max revs to change gear. 
Is this dangerous or is there nothing to worry about? 
Thanks.
                            
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                        I would suggest the screech is most likely to be a belt slipping - alternator or PAS perhaps. 
 
It might also be possible there is a very small air leak on the engine side of the turbo which is only aparent at full boost, so check all hoses and connections.
                            
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