I think I found it…
Went to vacuum fill today. Thought to myself, why don’t I check for the spring in the lower rad hose. Check this out.
You know when I said earlier, “it almost seems like the coolant sensor isn’t measuring coolant and is just measuring the temp of the heads. That’s correct. It was just measuring the temp of the heads.
Also, confirmed, you can drive an IDI for miles and idle it for 4 hours and it won’t overheat with no coolant flow.
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