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Q: Knocking/vibration when car is at Idle and when fan / a/c on. on 2000 Toyota Corolla

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Lightly knocking at idle, and much louder and faster when a/c or fan is on. The higher the a/c fan is on the faster and louder it gets.
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