I have recently been parking my car at the curb overnight and have noticed something I thought was kind of strange with the A/C. In some colder mornings (well cold for California), the temp is around 55 degrees or so. And on those mornings, I don't even have the heat on and I will feel hot air coming from the vents. Is this hot air based on the last temp setting, say 75 degrees or whatever temp I left it at last time? And on the contrary, on some warm days I go to turn on the A/C to cool down the car and I will still get warm air. These 2 "problems" generally occur first thing in the morning though. Any thoughts?