I purchased my 2016 ST three weeks ago today. When I drove home from the dealer, it was ~40F outside and I immediately noticed that the heat would only come on if the auto climate control was set to HI. As soon as I turned it down to 85, the car would start blasting cold air through the vents. I have now taken the car to the dealer for repair on 4 occasions. First time I was told that I could not use automatic climate control in Texas, the second time the blend door actuator was replaced, third time the HVAC control module, and the fourth time they replaced a temp sensor. The climate controls are still not functioning properly. I drove for 40 minutes this morning with it set to HI, and it never got warm in the vehicle. Does anyone here have any other suggestions as to what the problem might be?