B20forlife

So my car takes for ever to warm up the air in the heater and when it does it's not even that hot more like warm. I have triple checked the idrive. So decided to check the coolant temp through the hidden menu. Left work at 7:30 this morning and it's like 30* outdid right now. So after 10 miles if driving home the car was only like 55*c and after letting it idle for about 10 min in my drive way it got up to about 70*c. Is this normal? Could my thermostat be stuck open? I have a 2004 525i with the 2.5 m54 engine and 6 speed auto. Thanks.