I have a 65 coupe with a aluminum summit radiator direct fit. I been having problems of the car getting hot just sitting idle and in stop and go traffic. Installed the derale with the derale temp probe controller and started up the car let it sit idle and set the fan to kick on at around 195 degrees and wow it cooled the car down to 180 and held it there the whole time. The fan was pretty easy to install took about 40mins. Going to test it out in stop and go driving this weekend to see how well it performs.