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As the title suggests the coolant overflows from reservoir tank. 2018 Hyundai Elantra at 95,000 miles. The problem occurs only after driving 30-40 minutes and then idling afterwards. The temperature gauge never goes above halfway. Verified the fan works when idling with AC on. Verified coolant doesn’t start flowing right away after starting the car with radiator cap off. Also the hoses got warm only after running for 20 minutes indicating the thermostat seems to be working. I can mostly prevent the problem from occurring by running the heater while I’m driving.

Looking for any other suggestions of how to diagnose the problem.
 
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