Re: Overheating, tried (almost) everything.
Maybe drill 2 very small holes on opposite sides of your thermostat install it then with your radiator full start the truck without the cap on and let it run for a while, if it burps any coolant out replace that and put the cap back on and test it out.
It's most likely trapped air because it doesn't do it sooner.
Btw I had this problem and did this to my 425 Olds about 15 years ago and never had a problem since.
Good luck, overheating can keep you on edge and drive you nuts.
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