When it gets to the end of the '0' is when the fans turn on, ~210F-~212F according to my obd2 temp readout.
Your water pump may be in the process of failing, and can still circulate water, just not as effectively as a new pump. The fans are most likely able to pick up the WPs slack, which is why the temp gauge would get up to 0, but not go any higher.
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