         
NISSAN ALTIMA 2005-02 2.5L QR25DE ENGINE GENCO # 13939 NISSAN SENTRA 2005-02 2.5L QR25DE ENGINE GENCO # 13939 A low-tone whistling noise coming from the alternator after engine shuts down is a normal condition. This is caused by a rotor “slow-down” function that is designed into the alternator. The clutch pulley causes the noise. Reports indicate that many other vehicles with clutch or decoupler pulleys experience the same noise after the engine is turned off. Do not replace the alternator because of this noise. 
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