I have a 1991 Camaro. And some times after getting out of my car, and after I close the door. There is an "air puff" (like and an air bag deflateing) from under the car. It lasts for about half a second.

What is that

 

that wierd,maybe gas shocks? try driving down the road w/ the windows down and the radio off and see if u can hear it while ur moving. I dont know what to tell ya man

 

how bout the fuel system depressurizing or something.

 

Radiator leak? mine made this same noise when my upper radiator hose blew. :/

check for pinhole leaks.

 

It sounds like it come from the rear, so I dont think its the radiator.

 

Maybe your AC decompressing

 

Whenever you slam your door, it pressurizes the cabin, and that's just the air escaping out of a gap somewhere. More than likely anyway.

 

96lt1Camaro:
I never use my AC

DonHood:
I think it also happens when my t-tops are off.
I double check though.

 

Well, did you ever test it out with the tops off? I'm on the edge of my seat man.

P.S. 100th post.

 

Sorry I didn't drive the car this weekend. I'll let you know though.