I own a 2004 Envoy, with the six cylinder engine. When the engine is started and shut off almost immediately there is a sound that resembles the starter motor still running, but slowing down slowly. I was told this sound seems to be coming from the left side of the engine. The condition was noted when the car was started for the first time in the morning. My wife left something in the house and shut the engine off and notice the sound. A friend also heard this sound and confirmed it sounds like a fan slowing down and stopping. The engine starts fine, all electrical is working fine. Can anyone offer a suggestion on what is making this sound. Thank you. If indeed it is the starter, the bendix seems to be disengaged after the engine starts.