On my way to work at 11 pm with the windows down I notice the slight smell of antifreeze. Check temp guage and it was running normal. Didn't think much of it. But I made me aware as I kept lookin g at the temp guage. All of a sudden it went from about 1/3 all the way to the red line in a matter of seconds. I pulled over immediately and shut it off. When I got out I could hear something hissing and saw the smoke or steam . And saw the coolant all over the ground. I called for help and a friend showed up with water as I was only a few miles from my mechanic. I filled up the radiator and started it up to see if I could find the leak. Now while the engine was hot and scalding coolant everywhere I really couldn't get in there and really.check it out. What I did see was a steady leak coming from the drivers side of the engine bay what looked like right around where you fill the power steering fluid. I didn't see any hoses in the area though. I can't be 100% certain that's where it was. But it looked like fluid coming from there. Keep it mind I was on the interstate in the dark. I limped it to my mechanic and the temp didn't get that high again. When I got there it was just starting to creep above normal. Parked it and left it. Any idea what I'm looking at when I call him in the morning. Is there anything even in the area that would leak antifreeze? It's a 99 tahoe with the 350 engine. Thanks in advance