Unable to change air discharge location

[surferbear]

got an '04 xlt with 5.4L. for some reason I can't get the air to blow out from anywhere except the defrost vents. doesn't matter if its A/C or heat setting. is this an electrical problem or a vacuum problem?
also, there is a loud clicking coming from the back of the vehicle when the rear A/C and/or heat is turned on and through precise fiddling with the controls we can get it to stop but only for a short time. any ideas?
all advise would be greatly appreciated.

 

[bedrck46]

Incorrect/erratic direction of airflow from outlet — manual climate control

Function selector switch.
Vacuum hose.
A/C vacuum reservoir tank and check valve.
Vacuum control motor.
Vacuum actuator arm.
Mode door.


see picture
Item Part Number Description
1 18A318 Vacuum control motor — floor/defrost door
2 — Defrost air flow
3 18A478 Floor/defrost door
4 18476 Heater core
5 19860 Evaporator core
6 19805 Blower motor
7 — Outside air inlet
8 19A813 Air inlet door
9 18A318 Vacuum control motor — air inlet door
10 — Recirculated air inlet
11 18B545 Temperature blend door
12 18A559 Panel door
13 — Panel air flow
14 18A318 Vacuum control motor — panel door
15 — Floor air flow
16 — Vacuum from the engine intake manifold
17 19A563 A/C vacuum check valve
18 19A566 Vacuum reservoir tank and bracket
19 19A563 A/C vacuum check valve
20 19B888 ATC solenoid and manifold
21 18495 Heater control valve

 

[surferbear]

i'll check those out. thanks.