Hi,
The middle of the gauge doesn't sound like it's getting hot beyond what it should be. Tell me, has the mechanic tested the actual temperature of the coolant to determine if there is a problem? He could use an infrared thermometer to identify the coolants temperature.
If that isn't an option, the only other things left are if the cooling fans are not turning on when they should, or there is a partial blockage in the radiator slowing the coolant flow. You may want to try flushing the radiator and engine to see if that helps before replacing the radiator. Here is a link that shows how it's done:
https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars
Let me know if this helps or if you have other questions.
Take care,
'
Joe
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Wednesday, June 16th, 2021 AT 10:17 PM