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Unable to change the blower position, air is just coming out from the dashboard vents, moving knob doesn't change air direction. also when blower is set at 3 0r 4 unable to turn the temperature down. Temperature knob works fine at 1 or 2. I think there might be wires broken inside but not sure where to buy these wires from or what exatly are they called.

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The air will not blow through windscreen vents but is blowing through every where else. makes no difference when changing the direction of the knob to the windscreen only. you can hear the air blowing but nothing comes through?

Posted on Dec 22, 2008

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The fan blower, even after changing it to cool -giving hot air


i would think the vent direction control isn't moving the heater box vent , stuck in the open position so only hot air from the engine ,strip out the control panel a check that the direction control cable is connected both ends ,

May 07, 2014 | 1999 Toyota Avalon

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How to repair


i'd think that the vent adjuster knob/slider is not working correctly strip out the heater panel around the control knobs and check the vent direction is working properly either stiff operation so a little wd40 on the cable would probably do the trick or some thing causing the vent itself to not move

May 01, 2014 | 2004 Ford Crown Victoria

1 Answer

2000 Mercury Grand Marquis only blowing through dash vents


C Craft, it could be a couple of different things but from what you stated my best guess is it's going to be a issue with the door that diverts the air to the position that your selector knob is in on the climate control on the dash. If you can turn the selector knob and actually hear the actuator moving the door but the air doesn't change vent positions, then I would say the door is broke.
Now, you also want to check and make sure that there is vacuum going to the control. The main vacuum line coming from the engine is located around the passenger side firewall under the hood. Make sure the line is not broke or come unhooked. You can pull the control head out of the dash and actually crank the engine and check to see if it's getting vacuum that way by unplugging the vacuum line assembly from the back of the control head. If your getting vacuum to everything, then it will have to be a problem with the door itself which is in the air box behind the dash and it is not a easy fix. I would suggest having a qualified mechanic look at it if what I have told you don't check out. Hope this helps you.

Nov 26, 2013 | 2000 Mercury Grand Marquis

1 Answer

Air regulator valve on dash for heat and AC stuck in on position. Ram 2500, 2004.


The most common problem is a stuck or faulty blend door under the dash.

Feb 22, 2013 | Cars & Trucks

1 Answer

The blower on my a/c on 2002 chevy trailblazer only blows from the floor vents and the defroster vents but not the dashboard vents how can this be fixed. Also, it only works on 5


It sounds like you have two problems. First a question though; Is your heating and air conditioning control on the dash automatic (has two knobs that rotate and a display screen in the middle), or manual (has two levers that move up and down for driver/passenger temp and a separate fan knob and mode knob).

In response to the vents being stuck on defrost and floor, from experience i can say that the most likely cause is the mode actuator has failed. If your battery has recently gone dead, that could have brought the problem to the surface. When the battery has gone dead, the heating and air conditioning controls relearn all the positions of the actuators behind the dash when the vehicle has been re-started. If there is a position sensor failing (which happens quite often) in one of the actuators, the heating and air conditioning controls won't be able to learn the correct position of the actuator and (in your case) defaults to the defrost/floor position.

The only way to fix that would be to replace the actuator. I would like to know what type of heating and air conditioning controls you have (manual or automatic) before i say anything on the blower only working on 5.

Aug 05, 2011 | 2002 Chevrolet TrailBlazer

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

1 Answer

I am unable to move selector switch from any position - something in the internal workings is broken b/c the knob moves but the air vent direction does not change? how does it work? what is the name of the...


The system runs on vacuum supplied by the engine intake manifold. The switch uses the vacuum to open/close the various doors in the system by actuating diaphrams. The default is usually defrost, and the system will blow on the windshield if there is no vacuum supplied or if there is a vacuum leak in the line or in the switch. See if you can trace the small vacuum hose that comes from the engine through the firewall and up to the controller/switch and check for a leak.

Aug 25, 2010 | 2005 Saturn ION

1 Answer

I have the same problem with my windstar blower is fine but is coming cold air but no heat i dont know what to do can any one show me how to fix it thnx


First, feel the heater hoses going into the firewall under the hood. If they are hot, then you have hot engine coolant going into the heater core. If they are not hot, then you either have a bad thermostat or you are very low on engine coolant.

Next you need air flowing through the heater core so it can come out heated through your vents. If the iar is flowing somewhere else, your temp blend door is not moving because the bend door motor is bad or your temp knob on your heater controls is bad. The blend door motor is an electric motor.

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Air Flow Control
Air flow control is accomplished in the following manner:
  • Primary control is through the function selector knob , mounted on the heater function selector switch, which is part of the heater control .
  • The function selector knob has the following positions: OFF, PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST and DEFROST.
  • The 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 System Airflow Schematic and Vacuum Control Charts.
  • An internal single-pole electrical switch is also controlled by the selector. The switch controls the electrical supply to the 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.
Temperature Control
The temperature control operates in the following manner:
  • Temperature control of the heater system is determined by the position of the temperature control knob (between COOL-BLUE and WARM-RED) of the heater control .
  • This control knob is connected to a potentiometer mounted in the heater control . This potentiometer is electrically connected to the electric blend door actuator that operates the A/C air temperature control door.


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  • Movement of the control knob from COOL (Blue) to WARM (Red) causes a corresponding movement on the air temperature control door and determines the temperature that the system will maintain.
System uses a reheat method to provide conditioned air to the passenger compartment.
  • All airflow from the blower motor (18527) passes through the A/C evaporator housing .
  • Temperature is then regulated by reheating a portion of the air and blending it with the remaining cool air to the desired temperature.
  • Temperature blending is varied by the air temperature control door, which regulates the amount of air that flows through and/or around the heater core (18476) , where it is then mixed and distributed.
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inside you plenum box:

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Mar 03, 2009 | 1998 Ford Windstar

2 Answers

Heater only blows thru dashboard vents, won't defrost


chech cable on back of cluster dial some time pops of causing issue.

Jan 01, 2009 | 1995 Pontiac Grand Am

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