AC/Heater problems...

[r0lf-]

Well... I just installed a new blower motor in my truck in the last week or so. It works great and all, my heater blows really warm and my AC needs a recharge (what a suprise).

I have a bit of a dilema though, this interior has been updated to the new 87 interior, not the stock 78. Sooooo... the issue is, that when I goto place the controls for the heater on the defrost vents for the windshield, the vents arent opening, but the AC motor turns on. This is somewhat confusing me.

I remember on another post someone said that the vents are vaccum controlled, but I dont know where to look to enable this... so If anybody could post some shots or shoot me some info, id appreciate it.