Question about 1998 Ford Taurus

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A.C.vent flow Why does my A.C. unit divert air from the face vents to the defrost vents(windshield) when I give it the gas,but when I let off the flow goes back through the face vents?

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  • sov-ed May 11, 2010

    Sov-ed here. This is a common problem due to faulty vacuum module, or possibly loose or leaking hose.

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Headlights won't turn off.. 1998 fors tuarus

Posted on Sep 02, 2008

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2 Answers

1992. Why is hot air blowing through defroster vent?


If the air stream is not coming out the correct vent, then the switch/mechanism that diverts the air flow is at fault.

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On my 2005 Ford Taurus the air conditioning is coming out the defrost vents.


There is a flapper or trap door in the dash board that diverts air flow to various vents, defrost, floor, face, etc. If that stops working it will get stuck in the default position which is usually the defrost vents.

If you have a vacuum operated system you can check the vacuum hose for the system in the engine compartment for integrity. If that is ok then you have to get to the vacuum switch in the dashboard and probably replace it due to leaking vacuum - labor intensive and not cheap.

Any time the dashboard has to be removed you are in trouble money wise.

Aug 31, 2015 | Ford Cars & Trucks

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How can you change a heater switch on a 2000 Dodge Grand Caravan?


Its not your switch its the wire that connects to your air diverter.9times out of 10 either the wire is bent or broken,if not check to make sure there are no broken pieces of plastic on the inner facia of the unit itself.you wont know whats happening until you pull out the unit. Hope this helps get ya goin!!!

Aug 17, 2014 | 2000 Dodge Caravan

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I have a 2007 dodge 2500 diesel and the heater will only heat up to a very light heat.


Mode Door 1.
a.This door regulates air flow to either the dash vents or defrost/floor. If you have air flowing only through the vents with no defrost or floor, this door is failing. From our experience, this door is usually the first domino to fail. Not sure why, just is.
<!--[if !supportLists]-->4.Mode Door 2.
a.When mode door 1 is set to divert air away from the vents and into the second stage of the system, door #2 chooses whether air goes to the defrost vents to the windshield or out through the floor vents in the passenger and driver's side footwells. Failure is indicated by an inability to choose between defrost and floor.
b.This door turns out to be the most difficult to replace. In order to replace the door, the dash panel has to be removed. It's still better than the dealer fix because you don't have to evacuate the AC system, drain the radiator, and remove the plenum box. But it is more work than the other fixes. When this door breaks, it falls in the down position, blocking the floor vents and diverting all air through the defrost vents. From a safety standpoint, this is good since you'd most likely rather have a clear windshield than warm feet. We suspect that a large percentage of customers will just leave this door unrepaired. You will have heat through the dash vents and to the windshield, just nothing to the floor. It's inconvenient, but you'll have to make the determination if warm feet are worth the extra work to fix the door. An extra pair of socks is easier.

Jan 12, 2013 | 2007 Dodge Ram 2500

1 Answer

Little heat


Check the air divert-er door, does the air blow any harder when the panel controls are set to any other direction? If so check for blockage in the defrost vents.

Dec 13, 2011 | 2000 Cadillac Catera

1 Answer

Air conditioning, fluctuates between vent and windshield, when set on vent


Most common cause of your problem is the blower motor actuator. This module diverts air from the defroster, to vent, to floor and is vacuum driven. The vacuum leak is usually under the hood starting at the firewall on the passenger side and working your way backward.

Jul 29, 2009 | 2003 Ford Expedition

1 Answer

95 Jeep Wrangler air vent under the glovebox will not shut off.


Near the gas pedal is a linkage that diverts the air from defrost to front to low by your feet. Sometimes this linkage comes un-done. This could be fixed by holding it in place with a wire-tie. Let me know what you find.

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1 Answer

Turned air condition on, went to turn it off (button out) light is still on and color of light is green when on or off 2009 kia rio.


I may be able to help but, I need some more information. When you turned on your A/C what was the vent selector set at (Floor, Face, Defroster)?

Most newer cars with A/C systems have a built in setting when you set your vent selector to Defrost mode (blowing on the windshield) that automatically turns on the A/C unit. This is normal due to the fact that a fogged up windshield is from water vapor and the A/C does an awesome job of drying the air so it can more effectively and quickly remove that annoying water vapor from your windshield so you can see better while driving.

Try changing the vent selector to full face vent (the vents from the dashboard that you can adjust) and switch on/off the A/C and see if that solves your problem.

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1 Answer

When turned to defrost, no air comes out of vents to windshield. Air only comes out of vents in dash and floor. I have taken apart compartment behind glovebox and it appears that a glued lever has given...


The vent flap foam lining has come loose and needs to be removed or reglued . A spray on contact adhesive works best , don't glue the flap to the vent casing.

Nov 16, 2008 | 2005 Volkswagen Jetta

1 Answer

Air condition


Have you checked the diverter doors under the dash??
It sounds like a vaccum hose may have fallen off your vent controller.
I have had similar problems and found that the air WAS moving, but it was all going up through the defrost vents at the windshield.
A quick check of the vac. lines showed that one under the glove box was pulled off.
with the engine running, try setting the air settings to all the options ( vent/floor/defrost..etc..)
See it you can feel or hear the diverters moving under the dash..

Jul 02, 2008 | 1994 Chevrolet Lumina APV

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