...that shouldn't over flow like that. Even if the cap was bad. There must be air in your cooling system.
Causes...
Head gasket blown
Cracked head
Cracked block
Water pump shaft seal
Previous work not bled correctly
Reservoir over filled when cold
Too much water in coolant/ water boiling
I would make that a big priority to figure out.
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Coolant should be almost 50%. Or at least it was before I added a bit more water. When I added water its possible I added a touch too much, but not crazy. Ill keep an eye on it, replace the cap, and maybe bleed it? Whats the best way to bleed it? When I drained it last, I believe I refilled it, let it warm up with the cap off, then kept adding water once the t-stat opened.
It would be the pits if it was a head gasket or something cracked since I have almost zero way to fix that on my own...
Edit: If it was a blown head gasket, wouldn't it cause my truck to overheat and fill my radiator with air? Every time I have checked my radiator it was full of water.