My daughter is using this car while away at college. I had instructed her to check the coolant at least weekly and add as needed. I don't think she did. She was driving home and she called and said that the temp gauge is all the way up. I told her to turn the heater and fan on full blast and get off the highway to a gas station. She said the heater was blowing cold not hot. She had the car towed to her house. I tried to fill the coolant and as I put it in the reservoir it'd fill and then gurgle down filling the engine. I looked underneath and no leaks. I filled it some more. It did the same thing. I looked underneath again and there were a few drops. I added more and looked again. More coming out. I started the car and even more came out. I'm hoping that it's either freeze plugs or heater hose. As I said, standing it front of the car facing it, the leak is behind the left side of the engine. I haven't been able to get it on a lift yet. Any guesses as to where the leak is, how difficult and how exepensive it might be to fix?