Williebeamen201

Hi fellas, first time posting. I was driving in about fifty degree weather today around town with the temp hanging around 190 or so. I started to smell some antifreeze when driving, and when i got home some had boiled over out of the radiator cap. The low fluid light was on, but it isnt low on fluid, dealership even replaced all the sensors and thermo a few months back. Its an LT1 automatic with CAI and Cat back. It had only previously boiled over twice, on trips through the mountains. Like i said, the temperature gauge inside the car never went above 190, or barely above the 180 notch.... Any ideas? I know the fan doesn't come on until about 205 degrees, and there is sometimes a whine like a quiet blower (possibly a water pump). Thanks for any suggestions.