u/Melodic-Document1918

Sort of a looooooonger post, but i’m getting to great detail with this post ‘cause i cant ever get video of this phenomenon I need advice on what to do at the moment. Ive been chasing an overheating issue for over 3 weeks. Ive burped the system countless amounts of times, even with a spill proof funnel, opening bleeder valve, raising the car to the highest point i can. and still give it a couple of days of driving after work or driving around for a good day on the weekend, and boom. Same issue of it overheating. but its not like it’s about to blow the top off the cap. it’ll fluctuate when i’m driving, getting hotter when i get higher in rpm, and lower when i have it in neutral/ idling. I’ve switched out the thermostat, flushed the radiator, flushed the system twice for that matter, and still the same thing. currently stumped because I’ve also ran a block test and nothing out of the ordinary comes up. even after pumping for a good minute and a half. I’m thinking either the radiator isn’t keeping it cool enough, i have an airlock that just wont come loose no matter how long i bleed the system, or i have to replace a water pump, which wouldn’t make sense because the water pump thats on it was good when i installed it after changing head gaskets on it. either way, i turn to you all who could possibly note something thats completely going over my head (that tends to happen alot with the mind of a pop-tart). thank you in advance for the responses and feedback this post gets. good day to all!