Okay.. 88 Cutlass Supreme. I have been going through this car system by system, getting it ready for the road. However, when I set the dash controls to turn the A/C vents on (or just vent mode), no air comes out of the dash. I hear the blower motor running, and the compressor comes on, but no airflow. I am not used to this type of system (I am used to Chryslers, which use vacuum switches). Any help appreicated.