squealing noise when start engine? What causes that. on 1999 Mercedes-Benz C280

When. we start out mercedes the engine makes a loud squealing noise that may continue when we drive it for a period of time. We have replaced the anternator, belt and idler pump

by in Hanover, MA on February 01, 2011
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2 answers
ANSWER by , February 01, 2011
most likely the serpentine belt is slipping because the belt tensioner is failing
ANSWER by , February 28, 2011
may be and over chargibng or over worked alternator,have the battery tested and charging system checked at a benz shop,also make sure the belt and tensioner were replaced with german quality parts not the cheap aftermarket chinees parts