there is a timer on the remote start. IT describes this in the manual. You can extend the remote start cycle once or twice only. I think each press only gives you 10 minutes of engine run time. THis isn't a defect- it's not designed to run for 30 minutes in park. Also, there is a setting in the car that controls the max fan speed (to limit noise)- you should make sure your setting allows for MAX fan speed.