Question about 1999 Ford F150 Regular Cab

1 Answer

Switch on dash won't change direction of air to vent, etc.

I have a 1999 F-150, 4.2L, V-6. The switch on the dashboard that controls the air direction to the vent, floor, defrost, etc. sends all the air all the time to the defrost. The other switches work fine. Can you help me?

Posted by on

  • Ken Mifflin Feb 26, 2009

    You were very helpful. The hose going to the firewall had a hole in it. I replaced the line. However, my problem still exists. Everything goes to defrost. I had a check engine light come on recently that I was troubleshooting. I think the vacuum hose may have solved that problem.

  • Ken Mifflin Mar 08, 2009

    You were right on. I fixed the main problem and caused the other when moving the hoses around. Everything was tightened up and all works fine. Thank you again.

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Ford Master
  • 783 Answers

You have a vacuum leak,defrost is the default postion,no vacuum to controls. Check the small black vacuum line that goes thru the firewall on the passenger side of the firewall and trace it back to see if you can locate a leak. It will go to a vacuum resivior then to the intake manifold.

Posted on Feb 16, 2009

  • Chuck Martin
    Chuck Martin Feb 26, 2009

    you still have a vacuum leak though it may be inside the vehicle at the controls or one of the vacuum motors.Pull your controls out and make sure you have a good vacuum to black line there.

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

2007 Saab 97x hello i I'm having issues with my AC dashboard vent on my saab it blows air out of every other vent but the dashboard I was wondering if anybody knew what the issue was and how to fix it?...


Im sure you know there is a selector switch for foot, dash & defrost modes for heat or air. It could be either a fuse for damper control or linkage motor for damper control is gone bad.
Hope this helps

Feb 04, 2015 | Saab Cars & Trucks

1 Answer

Air only comes through the floor vents


You may have a disconnected control cable, either on the back of the control assembly or at the flap. More information about the car make and year would be useful.

Nov 22, 2013 | 1998 Dodge Ram 1500 4WD

2 Answers

Air only comes out defrost in all settings


I just fixed mine. The lever that opens and closes a door that directs the air flow to the defroster was broken. To be more specific, the plastic lever the actuator attaches to was broken. The actuator and the vacuum system were operating properly. It is simple to see but hard to get to. Remove the glove box and look up and to the left for a silver vacuum controlled actuator. I was able to fabricate another lever and attach it to what was left of the OEM lever.

Sep 20, 2012 | 2005 Cadillac Escalade Ext

1 Answer

I HAVE A 2002 FORD TAURUS 3.0 ENGINE. MY AIR ALL OF THE SUDDEN HAS STOPPED COMING THROUGH THE VENTS, BUT STRANGELY ITS COMING OUT OF MY DASH VENTS. I HAD STOP LEAK AND FREON INSTALLED AND STILL NOTHING,...


If you cannot change the air flow from the heater vents, defroster vents, to dash vents, etc. as your control switch indicates the problem could be a loose vacuum line. It could have come loose from the engine under the hood. If not you will need to remove the control from the dash and check for vacuum at the control. If you have vacuum there you will need to replace the switch,

Aug 02, 2011 | 2002 Ford Taurus

1 Answer

I have a 1991 camaro.The air or heat doesn't come out through the front vent when switch to vent control.It only come out through the dashboard to defrost the windshield..I have bought and install a...


It is the vent control. It is located on the passenger side behind the dash. It is vacuum controlled. It can fail and not let you change the vent positions.

Good Luck!

May 09, 2011 | Chevrolet Camaro Cars & Trucks

2 Answers

The air conditioning does not blow through front vents but through windshield vents, what is the problem?


This is a common problem on all Astro/Safari vans. The problem is a leak in the vaccum lines that control the vaccum switch responsible for changing air direction from the defrosters, dash vents, floor vents..etc.
Many of the problems that plaque the Astro/Sarfari vans and many other "Mini-Vans" is the build up of excess heat in the engine compartment. It\'s a tight place to put a V6-4.3 Vortec engine and the heat generated bounces back and cooks everything on the engine (coils, modules, sensors, wiring, and of course plastic vaccum hoses). No need to mess with your switches or anything behind the dash -- replace those thin plastic vaccum hoses to operate the vaccum switch (located just below the A/C canisters, to the right of the heater/ac blower housing) and your dash switches will magically send heated or cooled air where you want it.

Oct 25, 2010 | 2003 GMC Safari

1 Answer

The airconditioner in my car works its cool through the floor vents and the vents on the dash but no air is coming through the main air vents ? the car is a vs berlina with climate control ?


I would say that the control unit isnt switching properly,from the mode button moving the vents air flow direction,best bet is to try and swap a mates one and see if the mode changes the airflow to the main vents,it may be the unit isnt allowing the switching,i think theyre vacuum controlled

Nov 19, 2009 | 1993 Mitsubishi Diamante

1 Answer

Air stops blowing through the vents when accelerating


u have a loss of vacuum to the ac mode control switch, this switch applies vacuum to diff vacuum motors to move air to diff outlets, dash, floor, defrost etc. either the vacuum line or vacuum resivior at the engine is leaking or the mode control is leaking vacuum.

Aug 14, 2009 | 2003 Lincoln Navigator

1 Answer

A/C blows from defrost and floor vents, nothing from dash vents.


the switch where you turn it to blowing at your head is probably out. you will need to replace the switch control where your defrost, foot, head etc. what make, model, year is your vehicle?

Jul 09, 2009 | 1994 Toyota Camry

1 Answer

Switch on dashboard does not change air direction to flow & vents


Defrost is the default mode so if the system fais, you alays have defrost. The mode doors are controlled by vacuum motors. I would suspect a vacuum leak in the engine compartment on the hose going from the engine through the firewall and into the heater controls. Some systems have a vacuum storage canister that can also leak. The canister stores vacuum when vacuum drops going up a hill.
Or, you have a bad heater control head that is not passing vacuum to the vacuum motors on the mode doors.

Here's a diagram of the system for reference.

826b4f9.gif

Feb 15, 2009 | 1999 Ford F150 Regular Cab

Not finding what you are looking for?
1999 Ford F150 Regular Cab Logo

Related Topics:

327 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

yadayada
yadayada

Level 3 Expert

61168 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Fordexpert

Level 3 Expert

5331 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...