Overheating

I was on the interstate (70+) and my engine overheated, I didn't realize it until I got off the exit. I had a leak from an upper hose that I didn't know about. I've tried to "burp" the radiator, I keep adding water and antifreeze to the radiator (more water than antifreeze at this point). The resevoir keeps emptying, no puddles, checked the oil, it's a little high (warm) but not foamy. Car will run for a mile or two fine then starts to overheat again. If it gets a little hot and I stop I hear gurgling and see steam coming from the overflow on the resevoir. No funny noises from the water pump. What's the problem, and how do I fix?

A girl at work says I might need a new engine, might as well park it in the driveway and walk if that's the case. Any suggestions?

Engine Cooling problem
2005 Hyundai Elantra 4 cyl 45000 miles

I drive approx. 8 miles to work, takes about 15-20 minutes with some traffic. Since last September, every few days or so, as soon as I'm into the drive to work, the needle goes up and looks like my car is overheating. I immediately turn the heat on or turn off the car, and everything is fine.

As the weather has gotten warmer over the last month, I got more nervous because I knew I'd need the A/C. The last two or three times the needle would start to go up, and then would actually go DOWN when I turned the A/C on. This had not happened before, and in fact the opposite happened.

I've taken it to the dealer about 7 times in the last several months. They say they've checked everything and no problems. They've let it run for several hours parked; also, they've taken it out and driven for a couple of hours; they've run the A/C and it NEVER seems to overheat for them!

I would appreciate any helpful insight into my problem. I cannot keep missing work and magically, the problem never happens when it's at the dealership. Again, it is a 2005 Hyundai Elantra--that I just recently worked very very hard to pay off.

Thanks.

It overheats. I let it cool and start driving and then it shuts down will not start again.

For those of you who responded, thank you. Any ideas as to why the dealership is not able to catch if there is a problem with the engine coolant sensor? They have run it with and without the A/C, in traffic and not in traffic. And it just does not seem to overheat when they have it.

I read your conversation about 2002 Hyundai Elantra Overheating. I have a 2005 and that sounds like my problem. My question is, is that info good for me? I just not sure if thermo is were you said or at water pump? If at water pump I prob cant change?

Car only overheats while going uphill.

Several mechanics have looked at the cooling problems.

I noticed the upper radiator hose stays cool when the car is running, the lower is hot, when the car is turned off, the upper hose will then get hot.
Is this normal?

I do not see much flow when the cap is off of the radiator. The mechanics seem to think the water pump is good.