[JackMS]

All vehicles will do this, although some may be more noticeable than others. Automatic temp control makes it more noticeable. Most vehicles use a thermostat to turn the compressor on and off to prevent the evaporator from getting cold enough to allow the condensation to freeze. Don't know how these Tundras do it, but most vehicles with auto temp will basically allow the heater to work a little ( open the heater door flap some or whatever) to maintain a set temp. I work on ac's in 18 wheelers. They usually trip the compressor off at 42-45 degrees and back on between 45 & 50. I noticed that mine feels colder on hot days because it has to blow harder to maintain the temp. On cooler days, it feeles warmer because it doesn't have to work as hard.