Engine Cooling System problems of the 2004 Oldsmobile Alero

My Oldsmobile Alero continues to over heat. Every other day I go to the shop and they keep filling it with coolant. They are baffled because I have replaced almost every part on the engine and it still runs hot. I can't even get out of the parking lot without the temperature gauge going straight to the red zone. I always have to pull over, cut the car off, sit for 2 minutes, then start the car up again. I do not have money to continue to replace parts on this car and still have the same problem. On 7/25, I will not be able to pay my car note. Because on this date the mechanics are going to replace my radiator to see if the problem will cease. In my mind, I don't think so, but I am getting tired of going back and forth to the car shop and I am quite sure their getting tired of trying to figure out what is cause this problem. I need help in paying for my car in getting fixed, or tell me that I don't have to continue in making car note payments. My problem has been going sense April. I am getting tried of the car shutting down in the middle of the street every time it starts getting to the hot zone on the gauge. I am so nervous in driving this car on the freeway. The last time I drove it on the freeway was in June. This was because I spent $374. 00 on a water pump and then in a week, I spent more money on another water pump. Tune-ups, oil change, radiator flush has been done and I am still having the same problem. On 7/25, they are going to put a new radiator in the car. The car also acts like it doesn't want to stay started once you cut the car on. I would turn the key, start the car and wait. The car would start shaking and then cut off. I would start it again and the car would idle up, then down. I would really like to get someone to resolve this problem by helping my in paying for these issues that I should not be having. It is also giving a headache.