check the center vent , there is a wheel with blue and red dots . you can move the wheel up and down , if the wheel is set to the blue section the air will be cooler and when red is set there will be warm air .
thanks and let me know if this has helped or we have another issue
BMW Technician
12 YEAR MASTER TECH
This is a very common oversight . Most cars dont come with this option .
Thanks.
Please accept the answer .