cooling

Can anybody tell me where I could find a coolant air bleeder screw? I check all the online auto parts and even amazon and no one has the oneness for my year. I know the junk yard should have but there very far from where i live

I somehow managed to misplace my radiator drain plug (petcock) while working on the thing. I may have found a replacement but the item says it fits a 2001 Aztek. My question is, is there any difference in a 2001 radiator vs. a 2004 model? If its the same part I can order it and get this handled...

I have a 2000 Sunfire (2.2L). There was nothing wrong with this car until I decided to drive it after it had been sitting for a month in the hot weather. It overheated. I added water that day to the reservoir (as there was no radiator inlet that I could see) and it has continued to overheat...