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. Air won't blow out of the floor or center vents just defrost ? Do you have manual or automatic climate control ? Air Flow Control
Air flow control is accomplished in the following manner:
Primary control is through the function selector knob mounted on the A/C-heater function selector switch, which is part of the integrated control panel.
The function selector knob has the following positions: OFF, MAX A/C, A/C, PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST and DEFROST. The A/C-heater function selector switch combines a vacuum selector valve with an internal electrical switch.
The vacuum selector valve directs source vacuum to various vacuum control motors (18A318). Refer to the Vacuum Control Diagram , System Airflow Schematics and Vacuum Control Chart .
Two internal, single-pole electrical switches are also controlled by the A/C-heater function selector switch. The combination of these electrical switches controls the electrical supply to the A/C clutch and heater blower motor switch (18578).
The position of the function selector knob determines the manner in which the system will operate.
Each position of the function selector knob is detented for positive engagement.
Vacuum Control Motors
The vacuum control motors (18A318):
are located on the A/C evaporator housing, A/C recirculation air duct and heater air plenum chamber (18471).
direct system airflow to the vehicle interior as determined by the remote climate control module or manual override.
The five-passenger seating configuration has an additional vacuum control motor mounted on the heater air plenum chamber to control airflow to the rear seat A/C register (19893).
Clicking sound you hear is the worn brushes in your blower motor. At this point the blower moter may or may not start with the switch. THe blower motor is faulty so I would change that first, then check for vacuum leaks or faulty selector cable for the heat blend door. It could have came off door side or heater control side.
does it blow through the defrost vent only when you switch to vent/floor or does it blow through defrost and vent/floor? is it a switch that is just electric or a manual lever that you slide? the manual type will have that problem if the diverter or the linkage behind the lever(in the dash behind the panel......may be able to access underneath) becomes broken or disconnected so that the air is diverted to defrost regardless where you move it.if you can get to it, you will see what is broken or maybe a fastenerr fell off.
Hello, You would be wise to check all the small rubber hoses under the hood as it would appear that you have a vacuum leak preventing the airflow door from moving to any other position. Look for cracked /cracking, split hoses or disconnected hoses and replace as necessary.