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Nothing except the radiator cap
It will sit in the shop and run for a couple of hours, sometimes it does fine and then sometimes it will slowly start pushing the water out of the bottle and soon after it starts running hot. But, going down the road, it will be doing fine and then all of a sudden the hand will start rising and within a minute or two it's up to the H. Just so you know, the fans work fine. The slow one comes on like it should. As it gets hotter, then the other one comes on full blast. Also, I thought maybe the ac might have something to do with this. But it doesn't seem to. It does the same weather it's on or off.
I take it you didn't read the thing at the beginning when I ask the question. It ask what have you tried. I explained all the things that I've done and that was part of it. I've replaced the thermostat twice. And right now, I don't even have a thermostat in it. I have also checked it for gasses in the water 3 times. I also did a pressure test, a vacuum test on it and a compression test. All is good