Reply to "Ready for Vegas?"

I recently purchased a digital laser thermometer, and took some readings after the gauge read 220. The upper rad hose was 184 and the lower hose was 164 degrees. The overflow tank read 160 and the hottest part of the block was at 169 degrees. So I added another resistor, I may still need to add another one. So the car is running ok although the overflow tank is almost full when hot and nearly empty when cold the next morning. Is this much expansion normal?? Also has alot of hot ambient air in cabin too??