I have a 350 SBC that I just rebuilt, a new rad, and new A/C unit. The rad has the electric fans (2 - 12") behind pulling the air. I can put paper on the grill when the fans are running and the paper stays there. I have tried a 160, and 180 thermostat, the thermostats do open and I do get water flow. I over heating problem is both when I idle and when I am on the hiway. I have tried Wet Water, and tested the cap.

I just took the grill off of my 1936 Chev and noticed that the condenser is 12”w x 22”h and it covers my rad that is 17”w x 22”h. The condenser covers nearly 2/3 of the rad, so I was wondering if that could be the problem The Old Air Products installation instruction says the condenser should be installed with ¼ to 3/8” space between it and the radiator, being careful that they do not touch. I would think this would stop the flow to the rad and cause over heating. Would I not be better off to separate the condenser from the rad and put a fan on both? Have the Condenser and a fan behind it and then the rad with a fan behind that?