Coolant leak problems

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Run then no start

Chevrolet HHR 2007  188000 miles
I can drive 10 miles with no problems. All fluids good and no leaks. Thermostat new as well as oil. Battery from 2018 still holds charge and will start car but not until it sits for hr hrs for cooling down. Antifreeze not leaking and is only 3 yrs old from last flush. What electrical component causes this? Relay overheating or sensor? Please advise. Btw, antifreeze temps are stable at around 150-160 at idle. I've seen as high as 180 on the road.
Bewildered from United States 2 years ago  
BE
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