This is an intermittent problem which started a month ago and keeps getting worse. Everything works fine with the Climate Control when the car is started. The heat is good and regulates itself for about 45 minutes. After that it blows cold air. I have tried pushing different buttons, turning the ACC off then on, shutting the car off for a few minutes to no avail. The only thing that works is to shut the car off overnight. Then every thing will work fine for 45 minutes to 1 hour till the problem starts again. Some help, it's cold outside.