Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > 1997 - 2003 F150
Sign in using an external account
Register Forgot Password?


1997 - 2003 F150 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage SPONSORED BY:

Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 07-29-2009, 08:34 PM
spiffy spiffy is offline
New User
 
Join Date: Jul 2009
Posts: 2
spiffy is starting off with a positive reputation.
air conditioner blows thew the defrost

when going down the road, the air blows threw the defrost and on the down hill it comes back to the vent.
Reply With Quote
  #2  
Old 07-29-2009, 09:42 PM
steve(ill)'s Avatar
steve(ill) steve(ill) is offline
Post Fiend
 
Join Date: Jul 2005
Posts: 6,150
steve(ill) has a good reputation on FTE.steve(ill) has a good reputation on FTE.steve(ill) has a good reputation on FTE.
the air doors inside the duct are controlled by vacuum cylinders. if you loose vacuum, the cylinders go to the default position, and air comes out the defronst. normal areas to loose vacuum are cracked hoses at the firewall under the hood, between glove box, and center of truck,,, and the vacuum canister outside of the battery, in the fender well. small crack in hose or TEE will cause the problem.
__________________
2002 SuperCrew 4 x 4 5.4 XLT -115K miles -NEW
2010 EDGE FWD - V6 ----------40,000 miles
2002 Explorer 4 x 4 4.0 XLT --- 162,000 miles
2001 SuperCrew 4 x 4 5.4 XLT -235K miles -GONE
Reply With Quote
  #3  
Old 03-06-2010, 09:15 PM
JaredKingRanch JaredKingRanch is offline
New User
 
Join Date: Mar 2010
Posts: 1
JaredKingRanch is starting off with a positive reputation.
Air Conditioner blows out the defrost

I have a 2003 F-150 King Ranch 5.4 My air conditioner is also only blowing out of the defrost when set on "max a/c" however when I change the setting to "vent" the flap will open and blow out of the vents just not cold air. I have taken the dash off and watched the flap open and close when set to "max a/c" it will blow out of vents for a few minutes and then the flap will close and it will start blowing out of defrost...any suggestions on fixing would be appreciated
Reply With Quote
  #4  
Old 03-07-2010, 08:22 AM
steve(ill)'s Avatar
steve(ill) steve(ill) is offline
Post Fiend
 
Join Date: Jul 2005
Posts: 6,150
steve(ill) has a good reputation on FTE.steve(ill) has a good reputation on FTE.steve(ill) has a good reputation on FTE.
you still have a vacuum problme... there is a 3rd vacuum door that controls inside or outside air. It is normally set to suck in outside air. When you put it on "max" the 3rd door closes off the outside air and make the fan suck "recirculation" air from inside. That door is somewhere by the passenger side feet. VAacuum loss could be in the selector **** contol system, or a hose
__________________
2002 SuperCrew 4 x 4 5.4 XLT -115K miles -NEW
2010 EDGE FWD - V6 ----------40,000 miles
2002 Explorer 4 x 4 4.0 XLT --- 162,000 miles
2001 SuperCrew 4 x 4 5.4 XLT -235K miles -GONE
Reply With Quote
  #5  
Old 03-12-2010, 06:30 PM
newfordy newfordy is offline
Senior User
 
Join Date: Apr 2001
Location: Central Callifornia
Posts: 176
newfordy is starting off with a positive reputation.
vacuum problem most likely

Quote:
Originally Posted by steve(ill) View Post
you still have a vacuum problme... there is a 3rd vacuum door that controls inside or outside air. It is normally set to suck in outside air. When you put it on "max" the 3rd door closes off the outside air and make the fan suck "recirculation" air from inside. That door is somewhere by the passenger side feet. VAacuum loss could be in the selector **** contol system, or a hose
other possible leak locations. . . the resevoir/canister being cracked(most likely if losing control at throttle vs. idle), the check valve between engine and canister. report what you find as it will help others.
__________________
, '01SuperCrew-5.4L-4X4-BrightRed-Gaylord's bedcap-
DeeZee steps-Bedrug--real "air horns"(train horns comming)-AAAAND
Eye like it!!
Reply With Quote
  #6  
Old 06-22-2010, 11:52 PM
tdmontg tdmontg is offline
Freshman User
 
Join Date: Mar 2003
Location: South Eastern U.S.
Posts: 44
tdmontg is starting off with a positive reputation.
Quote:
Originally Posted by JaredKingRanch View Post
I have a 2003 F-150 King Ranch 5.4 My air conditioner is also only blowing out of the defrost when set on "max a/c" however when I change the setting to "vent" the flap will open and blow out of the vents just not cold air. I have taken the dash off and watched the flap open and close when set to "max a/c" it will blow out of vents for a few minutes and then the flap will close and it will start blowing out of defrost...any suggestions on fixing would be appreciated
I have the same exact problem on my 2002 F150 King Ranch. After many exhausting hours of troubleshooting, I got a Ford tech to look at it and run diagnostics. On the 2002/2003 F150 King Ranch it is an electronic temp control. I've heard it called an AC control head or auto temp controller, but it is the same part.
If when set to MAX air, the vents shut off and the air blows through the defrost vent, then this is the part that is bad. Ford sells the part for $479 but you can get a refurbished from Auto & Truck Electronics with a lifetime warranty for $125. The OEM part number is 2L3H18C612AA. Here is the link: ATE:High Quality Rebuilds at Exceptional Pricing
__________________
2002 F150 King Ranch 4X4, FlowMaster Performance SUV/Truck Series Exhaust
K&N Air Filter
HyperTech Power Programmed
M8000 Warn
Reply With Quote
  #7  
Old 06-23-2010, 07:31 AM
johnM101's Avatar
johnM101 johnM101 is offline
Junior User
 
Join Date: Jun 2010
Location: Dover, NY
Posts: 60
johnM101 is starting off with a positive reputation.
Question

could it be a pressure issue?

What controls the flaps is it air pressure or are they mechanically controlled by turning the ****?
Reply With Quote
  #8  
Old 06-23-2010, 10:44 AM
1975IH200's Avatar
1975IH200 1975IH200 is offline
Senior User
 
Join Date: Nov 2009
Posts: 198
1975IH200 is starting off with a positive reputation.
Vacuum, they work on vacuum.. If there is a Vacuum leak in the Vacuum hoses or fittings on the heater control, then the Vacuum leaks, and will not be strong enough to hold the air doors in position when the engine Vacuum is low. ie. during acceleration......
Reply With Quote
  #9  
Old 06-23-2010, 05:13 PM
johnM101's Avatar
johnM101 johnM101 is offline
Junior User
 
Join Date: Jun 2010
Location: Dover, NY
Posts: 60
johnM101 is starting off with a positive reputation.
thanks........
Reply With Quote
  #10  
Old 06-23-2010, 08:52 PM
steve(ill)'s Avatar
steve(ill) steve(ill) is offline
Post Fiend
 
Join Date: Jul 2005
Posts: 6,150
steve(ill) has a good reputation on FTE.steve(ill) has a good reputation on FTE.steve(ill) has a good reputation on FTE.
the electric control head that TD mentions has seveal outlet hoses to the cylinders, and one inlet vacuum hose. Knob directs the vacuum to each hose. seals (o-rings) in the controller can go bad and leak... thats what the "rebuild head" is... repaired with new o-ring seals inside.
__________________
2002 SuperCrew 4 x 4 5.4 XLT -115K miles -NEW
2010 EDGE FWD - V6 ----------40,000 miles
2002 Explorer 4 x 4 4.0 XLT --- 162,000 miles
2001 SuperCrew 4 x 4 5.4 XLT -235K miles -GONE
Reply With Quote
  #11  
Old 06-24-2010, 11:57 AM
Marauder2004's Avatar
Marauder2004 Marauder2004 is offline
Senior User
 
Join Date: Aug 2008
Location: Roanoke, VA
Posts: 226
Marauder2004 is gaining momentum as a positive member of FTE.Marauder2004 is gaining momentum as a positive member of FTE.
The Electronic Automatic Temperature Control (EATC) module used in Mercury Marauders, Grand Marquis, Crown Vics, Town Cars, F-series trucks, and numerous other Ford vehicles are essentially the same, with some minor functional and cosmetic differences, but they are the same inside. When the o-rings fail, the default setting allows air to only exit through the defrost vents. This is not the only condition that can cause this problem, but it’s the cause in over 80% of cases when an EATC is involved. If your truck or car has ***** rather than electronic buttons, this is not a solution for you.
Click the image to open in full size.

These instructions were written by a fellow Mercury Marauder owner who has experienced the failing o-ring syndrome of Ford’s EATC module, so I can’t take credit for it other than some minor editing. I have repaired a few of these and it's pretty easy.
Remove the Electronic Automatic Temperature Control (EATC) module from the dash. The EATC is usually mounted by four screws hidden behind a snap-on trim panel around the face of the module. Once you remove the screws, pull the module outward to get behind the unit to disconnect the vacuum and electrical connectors at the back of the module and remove the module from the dash.
Replacing the o-rings requires disassembly of the solenoids, but that's really not that hard to do, if you have reasonably good mechanical aptitude. But first, make sure they hold vacuum when not energized. Connect a hose to the center vacuum port (where the black vacuum tube was connected) and suck it.
It should hold vacuum. If it doesn't, the following fix probably isn't for you.
I used o-rings from McMaster Carr. You can get 100 for about $5, part number 936K12, silicon #007 o-rings. You will only need four. If you need some you can pm me for my address and send me a self addressed stamped envelope and I’ll send you some.

The solenoid assembly comes off the EATC module by unscrewing the two T-20 Torx screws on the backside of the module. Pivot the rear of the assembly up, and disengage the tabs at the front of the module. Disconnect the solenoid connector.
Click the image to open in full size.

Lay the solenoid assembly on it's back, and remove the 10 screws holding the solenoids and plenum strap to the plastic frame.
Click the image to open in full size.

At the wiring end of each solenoid, you'll see two metal tabs folded over, that hold the solenoid coil and armature to the solenoid frame. Straighten these tabs and then carefully pull out the armature, while watching you don't lose the spring or plunger that are inside. Note the o-ring on the armature. That's what we're after.
Click the image to open in full size.

Next, slide the coil off the end of the plenum tube, and then pinch the ends of the solenoid frame together to release it from the plenum. Once the solenoid is all apart, fit the armature back into the end of the plenum tube to check that the o-ring has a good snug fit. If it does, clean the inside of the tube, and reassemble the solenoid. You can replace the o-ring if you like, but if it fits well, there's no need.
Click the image to open in full size.

Make sure you pay attention to the screw flanges on the solenoid frame. Pinch the end of the frame together to fit it back onto the plenum. The spacer that goes at the plenum end of the solenoid has the inside diameter undercut, and four grooves. The undercut end goes toward the plenum, and you'll see four ribs at the base of the plenum tube that mate with the four grooves in the spacer.

The armature slides back on next, followed by the plunger, and then the spring. (The flat end of the plunger goes into the hole first, if you missed how it came out.) Use a bit of dielectric grease on the o-ring, (I used Nylog) but do not use any oil or anything on the plunger. Make sure the tip of the armature where the plunger seals against it, is clean and shiny. Don't get any dielectric grease on the
tip of the armature. Clean and dry is what you want here. Slide the armature back into the end of the solenoid, and while pressing everything back together, fold the metal tabs back over.

Repeat this for each of the four solenoids.
You might be tempted to only replace the O-ring on the leaking solenoid only, and leave it at that. Don't- do all four while you’re there!
Reply With Quote
  #12  
Old 08-04-2010, 11:01 AM
smithgaryk smithgaryk is offline
New User
 
Join Date: Jul 2010
Posts: 2
smithgaryk is starting off with a positive reputation.
2002 f150...When attempting to repair ac vacuum line in engine compartment, I pulled too hard on the vacuum line going through the firewall and line with a rubberized fitting came lose. I think this must have been connected ultimately to the AC control unit because now I only get air out the defrost whereas before this would only happen when I would accelerate. Does anyone have a way to either retrieve the lose vacuum hose through the small hole in the firewall? I also thought about just running a new vacuum line to the control unit, but not sure which line (color) it would replace. Any suggestions?
Reply With Quote
  #13  
Old 08-04-2010, 03:45 PM
thomastl thomastl is offline
Senior User
 
Join Date: Jun 2009
Posts: 207
thomastl is starting off with a positive reputation.
My experience shows that it is likely the o'rings as identified by Marauder 2004. I installed 007 the first time but had to redo it in about 6 months and installed 008 the next time. Seemed to seal better. Put a little synthetic oil on your fingers and rub the o'ring to lube it a little before installing will also help keep it from tearing and create a better seal. You can get th o'rings at any hydraulic hose repair place locally. (These are not #7 or #8 from Lowes. They are very small.
Reply With Quote
  #14  
Old 10-07-2010, 05:25 PM
EFM EFM is offline
Junior User
 
Join Date: Mar 2007
Posts: 64
EFM is starting off with a positive reputation.
Thanks for the info everyone my 03 Harley only blows through the def. I also have no heater anywhere. I strapped down one of the vent doors just above the gas pedal so I can have A/C through my vents....just a quick fix till I dissasemble my unit. thanks again
Reply With Quote
  #15  
Old 10-08-2010, 11:01 PM
EFM EFM is offline
Junior User
 
Join Date: Mar 2007
Posts: 64
EFM is starting off with a positive reputation.
The verdict: I couldn't make it to the parts store soooooo.......I wrapped teflon tape around the old o-rings and reassembled my unit and it worked. Thanks to all again. Now to figure out why I have no heater, but we'll see tomorrow.
Reply With Quote
Old 10-08-2010, 11:01 PM
Reply

Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > 1997 - 2003 F150

Tags
2001, 2003, ac, air, blows, conditioner, conditioning, default, defraust, defrost, defroster, f150, ford, truck, vents

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Air conditioning blowing only thru defrost vents pcdocta Cooling, Heating, Ventilation & A/C 20 08-06-2014 07:53 PM
Air Blowing through defrost vents only... jennshusbum 1999 - 2003 7.3L Power Stroke Diesel 8 07-26-2014 10:07 AM
Ac blows hot but defrost blows cold velocicurtis 2004 - 2008 F150 2 07-17-2014 10:39 PM
AC problem...HELP. Padlock 6.0L Power Stroke Diesel 11 07-08-2014 02:22 PM
Air only blows out defrost! viper29 6.0L Power Stroke Diesel 9 07-01-2013 07:27 PM



All times are GMT -5. The time now is 03:10 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup