Car- 1988 Caprice
Decided to start her up and take the caprice for a spin last week, winter is here so I had to turn on the heater and use the defroster for a while. While idle at the light I kept hearing this annoying sound from under the hood. Pulled over and checked it out and took a quick video with my phone.
Note!-It also does this when the AC is on.
Here is a youtube video link
http://youtu.be/waLlsp8pgG8
Also not sure if this is a issue with the vapor canister or not. But during the night I hear this LOUD bang from my car, and it only happens during the night. Every time I have to get up because I think it's someone messing with my car, plus my dogs go crazy. I later found out that its my gas tank expanding and making the loud bang noise. I decided to loosen my gas cap and I can feel a lot of pressure releasing in every turn. If I twist it off really fast the tank makes the noise too. I thought maybe something to do with the cold weather, but it also does this in the summer too. Then I figure maybe the vapor canister under the hood is bad or a bad gas cap. None of my other caprice ever did this, and never experienced this issue so I thought it was weird and wonder if this has happened to anyone else.