So guys, could really use some assistance on figuring out what exactly is wrong with my car. Last Monday the car overheated randomly and coolant started spewing from the overflow tank right after I shut the car off. I've already replaced the thermostat, water pump, and overflow tank cap. This was all done on Saturday, and the car ran great, until today. So now, I have no clue what else there is to replace besides the radiator itself. It started acting up again today after I had left home to travel about 15 miles away. The car drove fine all the way there, and then as soon as I shut the car off, I heard the same spewing noise and saw smoke coming from the hood. So I raised it and saw the coolant spewing out of the overflow tank reservoir again. I waited about 2 hours for it to cool down, and I filled the tank with 5 32 oz sized cups of water so I could get home. On the way home, I tried to keep the engine as cool as possible so I avoided any acceleration above 2000 rpms. The car didn't overheat on the way home, and then when I arrived I opened up the hood to hear the same spewing noise, but only minor coolant leaking occurred. Now, the radiator hose is really tense, like it has a lot of back pressure. Wouldn't this mean that the coolant isn't flowing through the system properly? Please feel free to ask any questions if I made something unclear. Thanks in advance guys!