The bleeder screw is leaking and this is the main issue. There are other potential cause for the overheating, such as bad bleeding, but over filled does not cause overheating. Was the red light turned on on the temp gauge? If yes then it's a serious problem if head is cracked.The bleeder screw was a bit mangled and steam was pouring out.
my question is what would cause this? Presuming I didn't destroy the engine, I would like to repair it, so I will replace the upper radiator hose.
could it have been overfilling or bad bleeding?
It had no problem until the mangled (cross threaded) bleeder had leaked enough coolant to cause overheat, regardless at what speed car moving.I think it would have overheated much sooner.
I love to see a pic of the melted thing.The threaded opening was pretty melted by the escaping steam.
No need to see the pic with all the steam and smoke as these cause the bleeder part out of focus. If you still have the hose, post a good focused pic of it. The steam is not hotter than the coolant, and the hose was design for this and so I don't think it was melted by the hot steam.It was 100% damaged by the heat - it had plastic filaments around the opening. That is not to say that the tech didn't introduce the leak, either by cross-threading or not tightening, but the steam definitely compromised the plastic:
This engine would be damaged before its steam can melt the any parts of the hose. It’s none sense.Nah, you can see the plastic filaments. Trust me, there was heat damage to the plastic. Remember that the high pressure would increase the local temp if the leak were a small opening.
See it to believe it.The top of the bleeder screw opening was degraded and there was a mixture of granular and filament plastic adhering around the opening.
