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"run hot" is correct and usable in written English.
You can use it to describe when something is functioning well or is on a high performance level. For example: "My computer has been running hot lately - I think I need to get it checked out by the technician."
Dictionary
run hot
verb
To run ahead of schedule.
Exact(60)
Yeah, I run hot and cold.
They were beginning to run hot.
BOINC may cause your computer to run hot.
"The machines run hot and have short lives.
That passions may run hot and blood run cold.
Toward that sanctuary and that stronghold, protective feelings run hot.
These are paintings in which feelings run hot.
These run hot and have a short battery life.
Emotions in China run hot on the subject of Taiwan.
"Things always run hot and cold in the tech industry," Mr. Hecht said.
That usually means the machines are pretty big, run hot and have noisy cooling fans.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com