I give up

Have you used an infrared temperature tester to see if it is actually getting that hot?

I have had 3 different vehicles where the temperature sender / switch was bad, and the entire time, the car was NOT overheating.

I found out by opening the petcock when it was supposed to be really warm. The water coming out was barely warm. 4 hours trying to burp this car, and the entire time, it was fine.

After switch, I agree, radiator...