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.
I think you just need to realize presets are presets and all Manufacturers use them today due to environmental protocols they must follow...we are lucky to have this options in North America, for example in Europe, leaving a car. Idling is illegal. You should also know there's no vehicle in the market right now with the built in remote start that allows for 30 minutes continuous warm up time, not sure where you got that idea or concept from. Also, where do you live in Alberta that it's almost - 40c??... The coldest we have experience in Calgary so far this year is - 26CWhen using remote starter to start 2019 blazer the heat/defrost does not come on full blast even after running for 30 minutes. Is this normal? Anyone else have this problem? I live in Alberta and it seems useless to have a remote start that doesn't warm up the vehicle or defrost the windows. If I go out to start the vehicle it runs for about 15 minutes and then quits. Defeats the purpose in having a remote start if I have to go out every 15 minutes to start the vehicle. And yes I leave everything on high when I shut the vehicle off, so it should come on at high when I start it with the remote. Don't think this vehicle was made for winters in Alberta.