Why do cold air blows out when i turn my heat on in my 2003 cadillac seville sls

What is your question?

Theres no crazy sounds or smells just no heat even when my car reaches proper temperature after drive or sitting running for a minute

What makes this problem better or worse?

It just blowing cold air

How long has your 2003 Cadillac Seville had this problem?

Since i bought it a few days ago