Cooling Issue

I know someone mentioned this but I don't know if you responded. Do you have a seal between your hood and cowl? My car would act like yours. I have a fiberglass hood with no seal on it. I tried everything to cool my car. Aluminum rad, Brassworks water pump, transmission/oil cooler combo (transmission doesn't go through the rad), steel 7 blade fan with shroud and electric pusher fan. It would run 180 while driving but get into any traffic and it was instantly 200 to 230. I was troubleshooting this problem one day and thought that I had solved the problem. The car was idling in my driveway and the temperature was staying at about 170 degrees. Estatic that I thought I had solved the problem I put my hood back on, left the car running and went upstairs to clean up before I took the car for a test drive. When I came back down it was now running at 230 degrees. I was thinking what the heck is going on? I found that if I blocked the area under the lip of the hood with cardboard the cooling was a lot better. It seems that what happens is hot air is forced out from underneath the hood and then gets sucked back into the radiator where it gets warmed up. It again gets pushed back through from under the hood and then back through the radiator to be warmed up even further. You can see how this is going to work. Try putting a few rags between the car in the hood if you don't have a hood seal (I used air-conditioning foam rbber seal from Home Depot) This will at least allow you to test this Theory out in your driveway. Good luck