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Q: Intermittant noise left front around 40 - 50 mph? Not present at lower speeds. on 2006 Pontiac Grand Prix

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
About 86k on odometer.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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If it's a 'roaring' sound , like you're in an airplane , and it comes in at a higher speed than it goes out , then it's probably the wheel bearing. You say it's intermittent , though , and a wheel bearing would most times be consistant in the speed range you're describing. May want to have a shop test drive it for diagnosis. Maybe offer $15.00 for test drive , if doing the repair yourself?
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