abduljaber

Good evening, I have recently bought an Audi A6 (Year 2007). I'm experiencing an issue where hot air is coming from the vent near the bottom of the front windows and the side vents only. Although the middle vents are blowing cold air. I have tried setting the heating to different levels but that didn't make any difference. It might be a user error as this my first Audi. Any idea why this happen please?