Why is my engine getting hot when plenty of coolant is in the reservoir?

I have a 1999 Chevy Lumina LS. The “Low Coolant” dashboard light came on but when I check the coolant level in the coolant reservoir, there’s plenty in it (way above the Hot line when engine is warm). The temperature gauge on the dashboard is showing that the engine temperature is increasing. It stopped at halfway after a 20-30 minute drive. It’s usually pointing at one-eighth of the guage. Is there anything I can do without getting a mechanic?



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