My car keeps over heating when I’m driving

Gotta agree , if I`m dressed up ,I dont want to sweat , just screwing around in the summer , no problem .
I f u work in a.c. its worse, in the summer I go outside and stay out there all day , the temps come up / u get used to it as it does .
Yeah, I'm an IT man, so usually work in a very comfortable environment. Stepping out of that into an oven is no fun!!! Years ago, I had a '68 Valiant (with a black interior) that I put a 360 into. Car ran very hot, and one day I was stuck in traffic for an unusually long time during the Summer. I know the engine was hot because it started running funny. I turned on the heater & put it into neutral to try and alleviate some heat. When I got home, my wife saw me and threw a wet towel on my back to cool me off. She said I looked really bad and I might be on the verge of heatstroke. That's no fun at all!