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I have a whirling noise coming through the air filter after the fan stops. on 2005 GMC Envoy

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The whirling noise continues through the Air Filter after the engine is shut off. Prior to this I was told my Fan Clutch had failed. We replaced the clutch but the sound continued for a short period each time there was a cold engine start. Only by accident I heard the sound again because my wife turned off the motor to go back into our home to get something. I tried it several times and the noise can be heard through the air filter for a few seconds after the fan has stopped turning. What can cause this?
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(4) Comments
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Is your air filter clean, and housing secure. Pull the filter and look through it and see if you can see light through it. Check throttle plates for black junk, maybe need to be cleaned.
cranberry juice gives it a better kick..........Pushrod should we let him in on the green jelly thing?
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