Question about 1998 Ford Expedition

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Suddenly the air conditioning air only blows from the defrost vents on top of the dash no matter what the setting is. Help!

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  • 689 Answers

The control switch is probaly shot, End needs to be (Replaced)

Posted on Nov 09, 2012

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

chiquititas
  • 1010 Answers

SOURCE: 97 mustang air conditioning

Many auto cooling/heating systems use a "blend door" which mixes both hot and cold air to provide air at the temperature selected with the temperature control. When the temp control is in the full cold position, the blend door moves to a position which allows only cold air to pass into the cabin/passenger compartment.
That blend door is generally operated with engine primary [unmodified intake manifold pressure] vacuum. IF there is a leak in the primary vacuum line system, then at low engine RPM the leak may bleed off the vacuum necessary to hold the door in the cooling position. Then when driving, the vacuum will be much higher, "over riding" the leak, and allow the vacuum motor, which operates the blend door, to hold the door in the proper position and provide only cold air to the cabin/passenger compartment.

Posted on Jun 24, 2008

philriden
  • 146 Answers

SOURCE: 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.

Posted on Jan 05, 2009

  • 37 Answers

SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR

Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.

Posted on Mar 13, 2009

  • 1 Answer

SOURCE: 97 Ford Econoline air conditioning and vent settings blowing hot

I know from experience that if the coolant is to low ( not just the freon levels in the compresor but the antifreeze/coolant level as well) the AC system will not cool and will blow hot. Check the coolant Antifreeze and freon levels, even with the Coolant being a little low my 1998 Ford E150 Van will blow hot. After you have ruled out of these possibilities and the chance it is the thermostat most likely the problem is what Ford calls the "Flap" it controls the air flow through the vent system when you switch from Heat to AC. When the Flap is working it closes off one systems air flow so as to not interfere with the current climate selection.

Posted on Apr 17, 2009

jonathancole
  • 127 Answers

SOURCE: My 2002 Ford F-150 air conditioning only blows

air condtioning is controled by vacum it sould be a valve under the dash on the passanger side try moving them with the air on to see which one it is

Posted on Aug 12, 2009

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I have a 1975 k5 blazer and it blows cold air it worked fine last year but now it only blows cold air even on the defrost setting what can the problem be and how can I fix it?


A vent flap actuator probably needs to be replaced. It's what moves your vent flaps from heat to A/C or to plain "vent air" when you change settings.

The discussion in the link includes vent flap actuators. Unfortunately, they also include the infamous no low speed fan problem too.

Cannot get any air from dash vents while defrost and floor vents work fine...

Your particular actuator will be a different one than they found.
They're all a absolute pain to get at because they can be well buried in the dash. I would start looking under the dash on the passenger side, that's where most of the air control is. Cannot get any air from dash vents while defrost and floor vents work fine...

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Blower fan not working.


Possible speed control is open circuit or the fan motor. Check you have supply to the switch/motor.

Apr 01, 2017 | 2006 Chevrolet Malibu LT

1 Answer

Dash vent air flow


Could be a problem with the control on the dash or a blend door under the dash.

Jul 07, 2013 | 2006 Ford F-250 Super Duty

1 Answer

The air conditioning blows out of the defrost vents. It only works on high now but use to on low. It use to come out of the front vents ocassionally. We did replace the heater / air control unit in the...


Seems like the dampers are partically closed,look under steering column and see your duck work for the vent system.Follow it back to the blower box.Unhook if there, turn on ac, if you get full air, nice and cold on low and high you have blockage in your vent duct work,check the vent line that diverts air to the diffrent selected vents. Also check for vent disconnection around sterring column,and defrost vent area.

Jul 14, 2010 | 1995 Jeep Grand Cherokee

1 Answer

Blowes air throught defrost vents only


its a problem with the switching mechanism. you have to look up under the dash to see if you can see where the switching mechanism is. if you can not see it from there youll have to remove complete center dash

Apr 04, 2010 | 2004 Jeep Grand Cherokee

1 Answer

When I turn my vent selector to defrost on the far right (air con off)the air conditioning comes on. The dash vents will blow ambient air, but defrost setting blows air con. Any ideas?


It's normal for the A/C compressor to come on with the defroster to dehumidify the air so the windsheild won't fog up under humid conditions. You can still control the air temp. out the vents with the temp. select switch.

Jul 19, 2009 | 2005 Jeep Wrangler

1 Answer

Air goes straight to defrost


You have a vacuum leak! Defrost is the default position. You need to find vent vacuum lines on passenger side near firewall under hood or under dash.

Apr 12, 2009 | 2003 GMC Sierra 1500

1 Answer

HVAC vent selector does not function. Air flow is


THe blend door seems to be stuck. When you change settings from defrost to floor air or, vent, the blend door opens and closes directing the air to the place you want it to go to. I have had some success spraying a lubricating oil such as WD40 under the dash on the blend door. You need to get under the dash with a flashlight to locate it. It looks like a flap. Spray it with a couple of shots of the WD40. Go easy on the spraying as you may be inhaling the fumes. Keep the doors and windows open to minimize the fumes. Wait about 1/2 hour and try the A/C functions. (defrost, floor, vent air)

Mar 09, 2009 | 2002 Buick Rendezvous

1 Answer

Air conditioning blows out of the defrost vents only


If this is the mechanical unit it is possible that the wire in the back has come adrift or the clip that holds the wire in position has come off and now the whole cable is moving.
Have a look at the bottom of the dash where the controls are fitted and move the control at the same time looking if there is any movement below the dash, take it from there

Jan 15, 2009 | 1998 Ford Expedition

1 Answer

Air conditioning and heating


have the water pump checked out, i had a van that did the same thing and founf i had a bad water pump it fixed the problem.also check the blower motor to make sure its working right by tapping on it while you have the car running. the car will survive dont worry its going to be one of those two things im pretty sure.

Jan 08, 2009 | 2001 Saab 9-3

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