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.

Dec 11, 2015 | Cars & Trucks

2 Answers

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

1 Answer

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

1 Answer

1998 lincoln mark viii all air flow diverts to defrost vent when a/c on and you accelerate...goes back to correct vent when let off gas


Usually a sign of a vac leak or a faulty vac storage tank. The storage tank holds engine vac to prevent your issue. Engine vac drops to zero when you are accelerating.

Mar 11, 2014 | Cars & Trucks

2 Answers

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

Air flow issue- intermittently blows from wrong vents


This is a common problem on this site.
In your case I would look for a vac leak or a sticky blend door.
Since the direction of air flow changes when you are accelerating, I'm going to guess the blend door or doors are controlled by engine vacuum. There may be a vac leak between the dash and the engine, or the blend door may not be able to move back and forth correctly.
Defrost is the default position when a problem occurs, to make sure the windshield is clear of fog or frost.

Jul 19, 2012 | 2005 Mazda Tribute

1 Answer

Air conditioner blows out defrost vents when acceleration.


In f150 truck there is a small vacum hose passenger side up by the windshield. It's a small hose check really good they dry rot and it will cause your vents to switch. Also if your box is bad. It's next to the battery

May 02, 2012 | Ford F-150 Cars & Trucks

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

Fan forced air trouble in a 2005 Focus


it could be a vaccum line thats disconnected or the bypass vent door that diverts the air is either stuck or broken.

Sep 16, 2009 | 2005 Ford Focus

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

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