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From Another C3 Forum:

"When I start my engine in the morning I hear a whine coming from under the left side of my hood for the first several minutes. Kinda like a whistle. Any idea what could be causing it and is it anything to worry about"?


The "whine" you're hearing is your alternator charging at a high rate because your starter just took a big bite out of your battery. As your battery get recharged the whine will lessen until you no longer hear it. And the whine is always more noticeable in the morning because it takes more starter power to spin a cold engine. It's nothing to worry about.
 
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