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Dodge sx 2.0, can't turn selector to have the heat come out the vents to clear the front windshield

The knob to choose where the heat is blowing from won't turn to the one to defrost the front windshield

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  • Diane Bernacki Dec 10, 2012

    Each time I try and turn the knob clockwise all the way to the right it basically snaps back to the vent aiming at the face. And the knob that selects whether the air circulates inside the vehicle or comes in from outside snaps back also. Is this a difficult thing to fix?

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  • Contributor
  • 17 Answers

You just need to replace the switch

Posted on Dec 10, 2012

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Posted on Jan 02, 2017

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  • 37 Answers

SOURCE: Heat wont blow through heater or defroster vents

The door in the heater box is most likely stuck. It is located under the dash on the passenger side

Posted on Dec 06, 2008

picatudo
  • 239 Answers

SOURCE: 2001 gmc jimmy defroster-heater blower will not direct heat

you have a vacuum leak

Posted on Jan 07, 2009

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

kn1ckfan
  • 8 Answers

SOURCE: 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)

Posted on Mar 09, 2009

  • 323 Answers

SOURCE: heating / air conditioning control stuck to front defrost vents

There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.

Posted on Jun 19, 2009

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2 Answers

Air will not blow to windshield or floor only front vents. whats the matter?


Always give details about your vehicle. Yr. make, model etc. Some vehicles use vacuum to control the HVAC doors. Some use electric motors. Could be a leaky vacuum switch, actuator, bad motor. Broken door.

Looks like other people have had your problem. Have a look here. http://repairpal.com/heating-and-ac-temperature-and-air-delivery-mode-door-actuators-may-fail-266

Jan 22, 2016 | Cars & Trucks

Tip

Tips for operating Air conditioning system on Toyota Hilux and someother...


To cool off your Toyota after it has been parked in the hot sun, drive with the windows open for a few minutes. This vents the hot air, allowing the air conditioning to cool the interior more quickly.

Make sure the air intake grilles in front of the windshield are not blocked (by leaves or snow, for example).

On humid, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

Keep the area under the front seats clear to allow air to circulate throughout the vehicle.

On cold days, set the fan speed to high for a minute to help clear the intake ducts of snow or moisture. This can reduce the amount of fogging on the windows.

When driving on dusty roads, close all windows. If dust thrown up b the vehicle is still drawn into the vehicle after closing the windows, it is recommended that the in intake be set to FRESH and the fan speed to any setting except "OFF".

If following another vehicle on a dusty road, or driving in windy and dusty conditions, it is recommended that the air intake be temporarily set to RECIRCULATE, which will close off the outside passage and prevent outside air and dust from entering the vehicle interior.

HEATING

For best results, set controls to;
Fan speed ---- Any setting except "OFF"
Temperature----Towards WARM (red zone)
Air intake ---- FRESH (outside air)
Air flow ---- FLOOR
Air conditioning ---- OFF

For quick heating, select recirculated air for a few minutes. To keep the windows from fogging, select fresh after the vehicle has been warmed.

Press the "A/C" button on for dehumidified heating.

Choose floor/windshield air flow to heat the voltage interior while defrosting or defogging the windshield.

AIR CONDITIONING

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

For quick cooling, move the air intake selector to recirculate for a few minutes.

VENTILATION

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

DEFOGGING

The inside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone) to heat; COLD (blue zone) to cool
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- ON

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

On humid days, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

DEFROSTING

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

To heat the vehicle interior while defrosting the windshield, choose floor/windshield air flow.

on Feb 14, 2011 | Toyota Pickup Cars & Trucks

3 Answers

Heat and air wont blow through vents


The selection door, is operated by 1/4" vacuum hoses. When turning the knob or sliding a lever, to select between floor, vents, or dash deck for windshield defrost, vacuum is created by the valve body and the blower will then blow thru the desired vents. When these hoses/lines are compromised, especially on a vehicle over 15 years old it seems likely, vacuum won't be created, and the last working position, is normally where it stays! Until the lines are replaced.
Good luck.

Mar 24, 2015 | 1998 Buick LeSabre

1 Answer

What is the problem with my mode selection knob?


HAVC Blend Door problem under the dash

Oct 03, 2014 | 2003 Kia Sorento

1 Answer

Why is heater defrost vents not working ?


Depending on the vehicle, it could be a vent door actuator

Aug 24, 2014 | Cars & Trucks

1 Answer

1997 Ford Taurus front defrost not working


. Air won't blow out of the floor or center vents just defrost ? Do you have manual or automatic climate control ?
Air Flow Control
Air flow control is accomplished in the following manner:
  • Primary control is through the function selector knob mounted on the A/C-heater function selector switch, which is part of the integrated control panel.
  • The function selector knob has the following positions: OFF, MAX A/C, A/C, PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST and DEFROST. The A/C-heater function selector switch combines a vacuum selector valve with an internal electrical switch.
  • The vacuum selector valve directs source vacuum to various vacuum control motors (18A318). Refer to the Vacuum Control Diagram , System Airflow Schematics and Vacuum Control Chart .
  • Two internal, single-pole electrical switches are also controlled by the A/C-heater function selector switch. The combination of these electrical switches controls the electrical supply to the A/C clutch and heater blower motor switch (18578).
  • The position of the function selector knob determines the manner in which the system will operate.
  • Each position of the function selector knob is detented for positive engagement.
  • Vacuum Control Motors The vacuum control motors (18A318):
    • are located on the A/C evaporator housing, A/C recirculation air duct and heater air plenum chamber (18471).
    • direct system airflow to the vehicle interior as determined by the remote climate control module or manual override.
    • The five-passenger seating configuration has an additional vacuum control motor mounted on the heater air plenum chamber to control airflow to the rear seat A/C register (19893).


vacuum control motor-i4bq0ig33y1522pr2d2rrkk3-2-0.gif

Jul 09, 2017 | Ford Cars & Trucks

1 Answer

Air blend door actuator


Possible bad blend door actuator .some gm cars can be relearned to the new climate control head

Jul 28, 2013 | 2001 Oldsmobile Aurora

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

Hello I have a 1993 dodge dakota but for some reason only the the windshield vents work when I took my stereo out i saw some unhooked hoses? Anyone know where they belong or how to hook this back up? help...


The vent selector works on vacuum. Those hoses are vacuum lines. They would connect to the back of the vent select switch, the one that you use to select what vent you want the heat to blow out of.

Jun 05, 2011 | 1993 Dodge Dakota

1 Answer

1998 Tercel Cold heat to the windshield. Lukewarm out front vent.


Hey,

I just replaced my thermostat in my car due to the same problem. Except mine was a 92. I figured I'd start with the thermostat and antifreeze. Then the heating core. Now I have heat.

But yet I still have no heat on the windshield.

Oct 23, 2009 | Toyota Tercel Cars & Trucks

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