I have a 2wd 88 Van that I have been trying to chace down an overheating problem. First off I think I replaced "the hose of Death".... Maybe it wasn't that one but it was a coolant line behind motor almost cut a hole in the van to get to it but lucky me I busted up all my fingers and finally got it off. after that it was still overheating and so I gutted out thermostat. tried to bypass front heater core and it still over heats... I even did a coolant flush with that stuff you dump in there with water let it clean and then dump it and it still overheating!!! I was going to get a new radiator but napa wanted 360$ I said thats to expensive guess. Crazy question but could the radiator cap be the problem... Any help or suggestions here would help a lot. I tried searching on here and didn't find anything that is the problem.

Please help I'm losing my mind...

Thanks