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Re: A/C airflow ( 1996 Ford Taurus)
It sounds like you might have a vacuum leak. The air doors that control where the air flow goes are vacuum operated, and if a line gets broken or dry cracks, the system will go to its "default" setting, which is usually either the defroster or the floor. Start at the engine and check all of your vacuum lines, both rubber and the hard plastic ones. There will be at least one vacuum line, usually a hrd plastic one, that goes through the firewall, near where the heater box is. Check them all. Remember that there are also vacuum lines that go inside the car, behind the dash to the control head. Good luck.
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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).
THAT BLACK HOSE IS PROBABLY COMING FROM HOOD LINER,THATS A BROKEN WASHER SUPPLY HOSE FOR YOUR WASHER NOZZLES TO SPRAY WINSHIELD OFF. HOWEVER YOU PROBABLY HAVE ANOTHER SMALL BLACK LINE THAT GOES THROUGH YOUR FIREWALL BEHIND DASH RIGHT UNDER PASS SIDE AND VERY BACK OF ENGINE COMPARTMENT. THAT IS A VACUUM LINE THAT SUPPLIES VACUUM TO YOUR A/C PLENUM TO ALLOW MODES OF OPERATION TO WORK WITH YOUR MODE SWITCH TO DIRECT AIRFLOW TO FLOOR,VENTS ETC... THE LINE IS BROKEN,DEFAULT IS DEFROST AND THATS WHAT HAS HAPPENED.
Does it still blow out the floor and defrost when you set the switch to those positions or does it alway blow out the defrost no matter what? If you can get air to blow out to the floor, then it sounds like you lost the switch that controls the airflow to the vents. If it only blows out the defrost, then you probably lost the vacuum to all of the switches. When the vacuum is lost, it will only blow out the defrost. Check the smallest line on the vacuum distribution block located in the corner near the brake master cyclinder. That line provides the vacuum to control the direction of airflow within the cabin.