A/C issue

About two months ago when I got out the car I heard a hissing sound coming from around the drivers side headlight. Shortly after I heard that I noticed my econ light was on and would not cut off. Well last week when I was working on the car I noticed the plug that attaches to the pressure safety switch was unplugged. I guess when I was adjusting my headlights I unplugged it and did not realize it. I plugged it back in and the econ light went off and only comes on then I press the button. Now my A/C does not get cold. Would a recharge fix it not being cold, or did that switch being unplugged damage something?