Im not very mechanically inclined, so bear with me.

Recently bought this car, had a crack in the radiator, so we (my dad and I) tried some jb weld, which didn't get the job done. Replaced radiator, ran good for around 2 weeks, then started overheating. Found that the water pump was shot, so we replaced that, and thought that everything would be fine. Well, everything wasn't fine as it ended up overheating yet again a couple days later. We flush the radiator, still no go. Find that one of the hoses was pretty much done for, replace that and a t'stat, still no go. Get to thinking that maybe we got a bad t'stat (our local autozone is pretty bad about selling broke stuff), so we install another one. Still overheating. Messing around with the little hoses (can't think of what they are at the moment) on the left side of the engine, we loosen a hose clamp and a crap load of air comes flying out. So we get as much air out of there as we could, and try running it again. still overheating. So, we try replacing the radiator cap, still nothing. We find out that the heater is shooting out lukewarm at best air, leading us to believe that coolant wasn't getting through the heater core. We let it run for a bit, and figure out that there is coolant getting there, but my dad in yet another great moment i'll always remember, left the radiator cap off and it literally shot redicuously hot water on me. We ran some more radiator flush through it, and it got to running alright for around 20 mins with hot air coming out when the heater was on, then suddenly the air got cool again and it started to overheat yet again.

All that is up to date, with me being sprayed about 3 hours ago. If anyone can make any sense of what I typed and most importantly what all that means, I'd greatly appreciate it. I know my knowledge of this kind of stuff is not good...at all, so if you need anything explained a bit more I will try to do that. Once again sorry for such a long post, but with the little I know about these things I thought it necessary.

Thanks

Sounds like there may still be air in the system. Jack up front of car, or place it on a steep incline, so the top radiator cap is the highest point in the cooling system. Take cap off and let it run for 10 or 15 minutes. Turn car off and watch for air to purge from the cooling system. With the radiator opening the highest point, the air has to escape through there as the coolant will force the air to the highest point.

You may have a blown headgasket? Check the oil and the spark plugs for water contamination. Do you have white smoke coming out of the tail pipe?

First let me caution you; overheating is the number one cause of blown headgasket(s) and they are expensive to replace. It sounds like you have touched all the bases and replaced everything that has the potential to cause overheating and I'm glad the hot coolant didn't hit you in the face or cause a severe burn.

Do what way2old said and purge the air and if that isn't it KimG is on the right track. I believe parts stores sell a kit where you take some of the coolant and put some test liquid in it and if it turns color then it has exhaust gases in it which means a blown head gasket.

What happens is, the combustion gases are being forced out of the combustion chamber through the head gasket into the cooling system and it forms a bubble, or air pocket. The coolant doesn't touch that area where the bubble is so it gets extremely hot and overheats. Then, when water does get to the hot spot it enhances the possibility of cracking a head in which case you I hope you have deep pockets and lots of $$$$$ to repair it.

Anytime your engine overheats, do not fool around and if you can't immediately find the cause seek professional help. If it overheats don't get impatient, take your time and let it cool down by itself for at least half an hour or longer and don't go putting cold water in a hot engine because you can crack a head, the block or cylinder wall. DO NOT EVER take the cap off the cooling system on an engine that is overheated because you could be seriously burned and/or scared for life. Treat an overheated engine like a big Rattle Snake. Let a word to the wise be sufficent.