I had a cold case on my 69 350 a/c car. It had the condenser on the front and it would always creep on highway speeds.sometimes up to 230. I ran a 195 thermostat and the cold case radiator and problem solved. Ran on rte 80 this summer when it was 90. Maybe it got up to 200-202 at 65-75 mph. That was 25 minutes out and 25 back. I just picked up another one for another car.