Is there any overheating problem? Cuz water pump are a common problem on the V6.
Is the upper radiator hose is hot when the cold reach his normal temperature?
If we are talking about the same part, which i though you mean the blend door (the trap that mix hot/cold air), you don't have to remove the dash.
Remove the glovebox compartment;
Remove the footwell trim panel;
On one side you will see the blower motor and on the opposite you will see the blend door motor.
Blend door motor location. Blend door motor screws. Nic.
