whining noise from under the bonnet

2006 RENAULT MODUS
21,000 MILES
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ROGERJC
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Renault mods whining noise from under the bonnet, increases with revs, sounds lick a pulsing diode, could it be the alternator, although no warning dash lights and shows no sign of low battery?

I have had the alternator bearings checked out and ok, with the belt removed the noise stops. belt drives alternator & air conditioning drive motor. Although the belt tensioner pulley spins ok without noise, going to try a new one? Any comments
Apr 3, 2012 at 9:13 PM
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RASMATAZ
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Also check the AC compressor
Apr 3, 2012 at 9:42 PM