Heat duct issues.

[rs74]

Since I bought the 85 k30 I have been wondering why there is only one duct in the dash not including the defrost duct. They had a custom deluxe dash bezel that had no vent in it stuck in the dash pad eliminating two vents. The one buy the headlight switch was covered up by a piece of metal. This is an A/C truck.

I tore the glovebox and dashpad off tonight to find that someone had taken the top half of the duct work out. So all there was is defrost and floor. There was air blowing on the underside of the dash the way they had it set up. So I am taking the needed pieces from another cab and putting it back together the right way. Oh and there was a white plastic clip that holds a threaded rod that goes to the blend door. The white plastic piece was missing so fixed that too.

What I am wondering while putting this back together is what are you guys doing for the big gap where the defrost duct hooks to the main box. Are you putting tape around it to seal it off so you get max airflow through the defrost? Here is a pic of what I am talking about. Both my K30 and K10's were like this. I can drop the defrost duct down but I would have to unbolt it from the dash so it can slide down. But if I do that then I don't know that the defrost ducts will blow air up through the dashpad.