Question about 2004 Chrysler Pacifica

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Heat/air vents for defrost and feet setting not working. Air only blows from center vents. Is there a vacuum line or electric switch to control the air flow to lower and upper settings on my 2004 Chrysler Pacifica? Thank you.

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I think your problem is mechanical. There is a distribution box behind thedash where flaps divert air to the specific locations although they may be electrically or vacuum actuated it is probably a mechanical linkage to these flaps or something is creating an obstruction. Check all the other connections while you are in there including any duct work to these areas

Posted on Oct 02, 2010

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Vents won't blow hot or cold air. Comes from defrost and feet when you put fan on.


It's the vent actuator, it moves the baffle that changes the direction of the air flow.
Here is a video of a broken vacuum hose that creates the same problem.

It could also be a failed actuator.

Sep 19, 2016 | 1997 GMC Safari

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

I have a 1995 Corvette and when I turn the air conditioner on the dashboard vents does not blow cool air


the a/c control is electric for temp control and vacuum for mode control when a leak occurs it defaults to defrost floor .look for a leak or broken vacuum line first then control panel then mode actuator.

Jul 30, 2012 | 1996 Chevrolet Corvette

1 Answer

My A\C stop blowing out the A/C vents but blows on high and low throw the defrost vent


If air not blowing out any other vents in any other modes. If it continues blowing out of the defrost vent , suspect a broken vacuum hose between the engine and firewall where it goes to the heater controls. Most systems that use vacuum motors to move the mode doors around are spring-loaded to go to defrost mode when there is a failure. That insures that even though your feet might freeze in winter, you will have a clear windshield. There is only one vacuum hose and check valve so there is nothing to mix up under the hood.

Besides that vacuum supply, it is also possible to have a defective vacuum motor under the dash. The clue to finding that is that some functions will change but some things will work improperly. It's when nothing changes at all when you switch modes that the vacuum supply hose should be suspect.-------
--------------- Your vent controller is not working. Is the air coming out the defrost vents? If yes, this is the default when there is no vacuum to the switch. In this case, check the small plastic vacuum line that is connected to the engine intake manifold and going into the firewall. Make sure this line is connected to the manifold and the hose is not cracked. If this is good, go inside the car and see if you can trace that line to the control switch. If the line is good to the switch, see if you can pull the vacuum connector from the switch for troubleshooting. with the engine on, check for vacuum on the line from the engine with your finger. If the vacuum is there, your switch is probably leaking and needs to be replace.------------ This will help.Thanks.Helpmech.

Jul 05, 2011 | 2003 Mercury Sable

1 Answer

2000 grand am se heater problem in the dash as described as being the actuator? motor comes up to temp,not overheating-blower motor works on all seting but as if temp switch on dash dont work. ---answers...


There are little doors under the dash that direct the air to either the vents (blows at your face), the defrost (blows at the windshield), or underneath (blow to your feet area) - these doors are controlled by what's called actuator/s and they are usually controlled by vacuum or cables - when the air won't change directions it can be either the vacuum switch, the vacuum line disconnected, cable disconnected or the actuator itself can be stuck or bad...

You also have a heater valve that allows the heated coolant to enter the passenger compartment into a heater core (small radiator to allow heat to transfer into the air when the blower blows air across the core) - this can also be vacuum controlled or cable controlled or electronically controlled - if it malfunctions then you may not get any heat into the passenger compartment - you will have to determine if the valve is not getting the signal to open or is bad and will not open - good luck :O)

Feb 17, 2011 | 2000 Pontiac Grand Am GT

1 Answer

Jeep AC blows cold air at defrost and feet but not through vents


There is a flap that directs the air. the flap is controlled by a vacuum actuator. This is located inside the venting. The actuator is connected to little vacuum hoses that attach to the temperature control switch. Either the flap is stuck, or the actuator has gone bad.

Jul 01, 2009 | 1999 Jeep Grand Cherokee

1 Answer

A/c blower issue. 2202 chevy trailblazer


your blower resistor bad or the blower motor control switch is bad. no air flow from top vent make sure vent open.because you can manual adjust them not to blow air on you.if all is good.you have leaking vacuum hose or vacuum actuator.or air door stuck.the AC and HEATER control switch.is bad.its not allowing vacuum to open air door.

Jun 22, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

1996 ford mustang convertible ac blows cold only from defroster


Does it still blow out the floor and defrost when you set the switch to those positions or does it alway blow out the defrost no matter what? If you can get air to blow out to the floor, then it sounds like you lost the switch that controls the airflow to the vents. If it only blows out the defrost, then you probably lost the vacuum to all of the switches. When the vacuum is lost, it will only blow out the defrost. Check the smallest line on the vacuum distribution block located in the corner near the brake master cyclinder. That line provides the vacuum to control the direction of airflow within the cabin.

Jun 08, 2009 | 1996 Ford Mustang

2 Answers

No air, ac, heat out of in dash face vent


check the hoses connected to the vacuum advance ball, it has probably begun to decompose...

Aug 05, 2008 | 1996 GMC Jimmy

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