I have a 92 Grand Am, Quad 4 Single cam with 169,000 miles. The blower and all heater & air conditioning controls work fine but little air blows out of the vents. Any thoughts? Thanks.

Welcome to the forum. Are you able to control the direction of the airflow? If not, then I would say one of your directional doors is stuck, and possibly disrupting the airflow. If your directional switch works fine, then I would say your fan is actually worn out, and can't blow hard enough anymore.

What ridenour said or your evaporator core is clogged up with dirt n crap, it's a common problem.