HVAC is working, but the cold air coming from vents is low.

What is your question?

The HVAC is working and I hear the HVAC air motor operating, but little air flow is coming through vents. Also, the control isn't flowing air as positioned.

What makes this problem better or worse?

When I change the position of the air flow control.

How long has your 2002 Chevrolet Suburban 1500 had this problem?

Since the new air compressor was installed last year.