Q: My car runs hot and overheats

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My car was overheating so I booked an inspection through Your Mechanic a couple months ago. The radiator had a leak and the coolant was low. Other than that the mechaninc said everything else was ok. I had the radiator replaced and my car was running fine. Now it started running hot again and overheating. The coolant level seems ok and the fans work. I noticed on longer trips (es. 30 min on highway) the temp gauge sits half way until I arrive at destination and it spikes up. The temp gauge started reaching the halfway mark pretty soon, it wasn't like that after I had the radiator replaced.
What could it be? Thanks

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