2005 Chrysler Pacifica, 128,xxx miles. As I was driving the car today I felt the heater in the car start blowing cold air. Stopped at a stop sign and the car stuttered and died. I put the car in park and restarted. Drove a short distance and the coolant light came on and temp was on red. Pulled over and turned the car off. Opened the hood and the top radiator hose was off and had spewed the coolant all over the engine and hood. Looked like the coolant came out of the hose, hit the fans behind the radiator and sent it around the engine bay. No coolant in the tank. A man in a Pacifica pulled over and he looked at the hose and was able to put the hose back on. I added 1 gallon of coolant to the tank, started the car and temp was normal and light was off but had the car flat bed towed home anyway.Tow company had me start the car and drive it off the flat bed and into my driveway as well. As it was sitting on the driveway there was dripping of the coolant under the radiator and under the tank where we poured it in (we didn't have a funnel and made a mess). I used some warm water with a little soap and poured it over the parts inside that had been covered in the coolant since it is corrosive. I went out and checked it recently and it looks like all the moisture on the ground is drying up and I don't see any new coolant dripping. The tank is empty though but I now realize that it needs over 2 gallons to totally fill it. I have not started it since I drove it off the tow truck.

Any ideas on why? Car is overdue for an oil change and I have not changed the timing belt/water pump yet.