Had my radiator replaced recently, and my cooling problems seemed to go away. However, just today I noticed something odd in that when I was parked, my cooling fans weren't turning on at 220 (they usually turn on before then) but my temperature gauge didn't seem to go any higher than that, even after a minute or two of waiting to see what it would do. I turned on my a/c, the cooling fans turned on, but then off a few seconds later. The weather is about 55 degrees at the moment, if that has any bearing.

Ideas?