HomeAll RepliesReply To: Pre-start and post shutdown noises Reply To: Pre-start and post shutdown noises Sponsored November 17, 2022 at 11:17 am #734735 firepoggyParticipant The noise you hear after shutdown is most likely the vents being cycled behind the dash Sponsored Subscribe to GM Authority For around-the-clock GM news coverage We'll send you one email per day with the latest GM news. It's totally free. First Name Last Name Email Address Subscribe via Email Leave this field empty if you're human: Sponsored