Q: air conditioning - hissing sound when car is turned off for about 10 seconds on 2004 Ford Explorer

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ac was not too cold, hooked up the recharge unit and adjusted for outside temp 85 degrees, said pressure should be between 45-55psi, emptied can and pressure was about 45psi. ran car for a few miles, seems like temps are colder but when I turned off the car I hear a hissing sound for about 10 seconds coming from the area near the ac lines. but I can't see any oil or liquid on any of the lines. tried it a few times, same result. turned off ac and then started and turned of car, no hissing sound.
did I over charge? or is this normal. Can only hear it when the hood is up and you have your head over the engine.
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