Hissing Sound

[sandman0023]

I just finished my battery rolocation and now I have a hissing sound when I turn off the car. I didn't loosen anything in the engine bay so I'm stumped.

 

[Camman]

a little more detail would be helpful. Where exactly is the hissing coming from? how long does it last? notice any other signs of anything?

 

[MustangLX-5.0]

Radiator cap not on tight? Vacuum hose get pulled accidently? Heater - A/C control still turned in position besides "off"? A/C drain pipe dripping water onto header pipes? Get a hole in one of your tires? Late night boozin at Club X perhaps had you orally relieving yourself on your header pipes and you don't remember a thing