Question about 1995 Ford Thunderbird

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My ac air is blowing only out of the defrost vents the selector is set to max air. the system was working fine. then when i started up car again the air wasn't comming out of the correct vents i didn't change any selector settings

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  • Ford Master
  • 6,826 Answers

The vacuum motor may have become disconnected from the vacuum lines, or the control for the blend door is bad.

Posted on Aug 19, 2010

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Posted on Jan 02, 2017

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2 Answers

Why does Air flow to windshield defrost vents only?


Most often the problem is in corroded negatives.
Go into the engine compartment and , one at a time with the power off, unscrew a ground wire on the wheel well or the firewall and clean the corrosion off it. Replace each one and tighten carefully. Repeat for every ground you can find. While you are at it, disconnect the battery wires and clean them too. When done, start the engine again (sorry, you might have lost all your radio settings!) and try the switch again. Even the engine may run better.

Nov 05, 2014 | 1996 Dodge Ram 1500 Club Cab

1 Answer

What causes the ac to blow cold in the rear but warm air in the front?


These vehicles came with 2 types of ac controls.
The vacuum control system uses vacuum to actuate the vents and ducting from hot to cold. A lot of times the HVAC vacuum line in the engine bay (black hard plastic) is either broken or disconnected from its vacuum source.
The electronic vent control: does everything at the control knob via vent actuators and the control panel itself. With this one it could be any of the components. You would have to locate them and verify operation by moving temp/vent selector.

May 08, 2014 | 1997 Ford Expedition

1 Answer

1997 Ford Taurus front defrost not working


. 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).


vacuum control motor-i4bq0ig33y1522pr2d2rrkk3-2-0.gif

Jul 09, 2017 | Ford Cars & Trucks

1 Answer

My ac unit is working but will not blow air out of the dash vents. The blower is working


Hey man if the blower is working and air is coming from your other vents i have a few ideas.First i would start by checking your vent selection switch something may be stuck where the dash vents open. If the selector is fine you should try checking the ducting behind the dash it could have come apart or simply be cloged where it routes air to your dash. hope that is helpfull.

Aug 11, 2012 | 2004 Chevrolet Tahoe

1 Answer

1999 durango vent control switch will not let AC blow threw vents only defrost


Usually this is a problem with the blend doors under the dash. You either have a vac leak, a dead motor, or a faulty door.
The control opens and closes the doors to direct air thru the heater core and evaporator core along with directing air thru the vents.
When a problem occurs, the default position is the defrost vents to make sure the windshield remains clear.
You can do an internet search for "repair durango blend door" for more info.

Jul 29, 2012 | 1999 Dodge Durango

1 Answer

My ac will not blow alot of air through the vents,although it can be heard like it is pretty high or max.


Sounds like the vent selector is not switching it all the way to the vents. Its probally getting stuck on the floor output or defrost. Is it digital are cable driven? Try turning the fan speed to the lowest setting, switch it to defrost, then back to vent and turn the fan back up to hi.

Jun 26, 2011 | 1988 Chevrolet Corvette

1 Answer

2004 Chevy Silverdo Crew Cab


if your ac is on max i believe it recirculates the air in the car by sucking air in by the defrost vents and blows it back out of the normal vents try to move the controls to make sure the that the shutters are working and make sure the ac is not on max by selecting the knob that has an arrow going through the little car instead of the circular one that might fix the problem

Jun 29, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

Ac on 2003 f150 supercrew blows air out defroster when on max


Check for vacuum leak going to air inlet door. Should be a white vacuum hose.

Jun 21, 2009 | 2007 Ford F-150 Harley Davidson

1 Answer

1998 Mustang - AC blows only through Defrost vents


You probably have a vacuum leak on the passenger side. its a small plastic hose some times they come unpluged from the engine. or brake.

Jan 05, 2009 | 1998 Ford Mustang

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