So I know that there are certain valves and flaps that close after you turn off the car. I lived with that and it's supposed to be that way.

Summer is coming and now that sound is like an elephant song. I can only surmise that the valves/flaps are catching as they move. I'll definitely investigate, but thought I'd ask firsthand where these are and probable replacement costs.

On that note, the doors are complaining too... I need to lube them up well...