Our temperature dropped into the 20's. I had to take my two yr old grandchild with me at 7:30 am to drop her brother at school. I went out to warm up the car, fifteen minutes later, the car had not warmed. Twenty five minutes later as I'm driving, still no heat. Thirty minutes later, the heat blasts on. With everything else that's going on with my car, I truly think that I'm having computer problems. Add air to tires and overheating messages coming on.