Engine noise after engine is off and fan has stopped turning. What causes this? on 2005 GMC Envoy

I was told the whirling noise was caused by my Fan Clutch. The clutch was changed and the noise continued. Only by accident I was standing in front of our Envoy when my wife turned off the engine to get something from the house. The noise continued. I started the engine again and then turned it off. I watch as the fan stopped, but the whirling (jet) noise could be heard through the Air Intake of the Air Filter.

Asked by for the 2005 GMC Envoy
1 answer
What is the trouble you are having other than hearing the engine come to a stop??