Oldsmobile/Buick Repair: 1984 delta 88 heater, 1984 delta 88, control panal

Question
Have 88-delta. I replaced heater core that was leaking,now I have just luke warm air for heat. My flow is good because I checked all hoses and they are all hot. I get warm air on the floor but not on defrost,could it be in my control panal

Answer
My guess is that one of the door controls got pulled loose, and the air flow doors are not working as they should.
Yours may be vacuum, or cable controlled. Or even a combination of both. But moving the housing around probably pulled something loose.
Van