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Strange but you definitely have a blockage of coolant flow. Perhaps the engine overheated and didn't want to start because of expanded metal parts? Wherever the temp sensor is is at least blocked. I would drain the coolant and get an air compressor through the hoses and see what's up. Check your thermostat.
You say it runs fine in cooler temps, well that could just be an illusion because the right variables are working together. I wouldn't drive it very far until you get this fixed.
My old mustang overheated once and it wouldn't start until it cooled down. I'm not sure if this is a safety mechanism or if that's just how hot engines act....
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