Sounds like the vac control pot is not hooked to the heat door. The
cable controls a door between the heater core and the A/C. That door
just puts air through the heater core or bypasses it. All the rest of
the controls are vacuum powered. If you have heat coming out at the
defroster vents but cannot get heat to the floor vents check the
transfer door that is on the left side of the plenum above and to the
right of the steering column, It moves the door that directs the airflow
from the floor vents to the defrost vents. It is a PIA to get to. If it
doesn't move when you move the controls from A/C, vent, defrost then
either it is bad or it isn't getting vac. I would pull the heater
control back out and use a small vacuum source to apply vacuum to the
Hose color (can be striped or solid color) - What they control
Gray - Vac source from engine.
Black - Heater/ Defroster control (one that is probably bad on yours)
Orange - Outside air/ Recirculate valve.
Tan - Panel door, This is the door on the passenger side behind the
kick panel like the old manual vents and a control under the cowl panel
below the wipers that allows outside air into the vehicle.
Dark Blue - This one also goes to the Heater Defroster door, It only
works when in Defrost and it allows the air to go through the A/C evap
core to dry it out before putting it on the glass, helps prevent fogging
"LS" < firstname.lastname@example.org> wrote in message
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