im having trouble with my heater a/c control,when i put the controls to defrost air is routed to the floor if i select a/c normal it directs the air to the defroster any advice is gladly accepted
70 ss396 with a/c automatic

Check the routing of your vacuum lines from the A/C control manifold (behind the A/C -Heater control levers) to the vacuum control pods on the A/C-Heater suitcase beneath the dash. Sounds like a couple of them are going to the wrong side of the pod.

Louie