Air Conditioner too cold on low

I have an '08 2720SL and can't seem to set the thermostat to stop producing cold air. Compressor does kick on and off but is too cold on the warmest setting at nite and must be turned over to just the fan setting. Do all TM ac's have the "always on" blowers? Anyone have this problem? I always seem to read about "not cold enough" problems.