Why won't the air stop blowing in my car?

What is your question?

When I turn on my car and the AC is turned to off it will blow like it is on the first strength. I have control over tempature and what vents it blows through but no matter what I try it won't stop blowing.

What makes this problem better or worse?

When I have it turned to the highest heat setting

How long has your 1998 Chevrolet Lumina had this problem?

Three months