Question about 2004 Mercury Mountaineer

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Where in the heck is the blower motor resistor located on a 2004 Mercury Mountaineer Premier? Diagram?

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  • tkkmac Jul 11, 2009

    Kevin,



    Don't know if this makes a difference but it is an all wheel drive SUV. I do see on my vehicle what apprears to be the motor resistor based on the picture you sent but it doesn't match the part that 4 different places is telling me what I need. The part I bought has a plug and what looks like a credit card sticking out. What i see under my glove box is 5 wires that plugs into a box (simular to your photo) and when I remove it there is no way that it's correct to the part I've been told to purchase.

    I know this should be simple but struggling?

  • tkkmac Jul 11, 2009

    Here you go.

  • tkkmac Jul 11, 2009

    Is there any other place that the resistor could be located? I really believe it just doesn't exsist under the glove box. I'm no mechanic but mechanically inclined. Just so you know I even called the Ford dealer ship about the part and they told me the part I have is correct. There is no obvious place for this part to go under the glove box.

  • tkkmac Jul 12, 2009

    I really appreciate the help I was given! However, I am still at a loss for the answers. Is it possible that a front blower motor resistor doesn't exsist in a 2004 Mercury Mountaineer v8 Premeir?

  • tkkmac Jul 13, 2009

    Thanks for the video but those are for late models. My blower motor is under the glove box. I have none of that under the hood. I also have dual zone controls. I'm going to take a step back and indicate my whole problem. Put the keys in the ignition and the fan blows at high speed. The air works but only will blow at high speed. With this in mind I did my research which led me to the Blower Resistor but once again I can't find it anywhere, not under the hood, behind headlight or under the glove box. By the way the rear one is located in the left rear access panel where it was suppose to be. I'm sure it is somewhere...but where?

  • tkkmac Jul 13, 2009

    I attached a photo to what those wires plug into. It is a pack which when disconnect it has a core that sits inside the duct work. That certainly may be what I should be looking for but then they must call it something else like maybe a control module??? I can't find a photo of that part on any parts suppliers. Do you think this is the part I need? It has a number on it 3L2H-19E624-AA



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Is you mountaineer equipped with normal one climate control zone for the whole car, or does it have dual climate control zones controlling the driver side and passenger side independently? Cause in some cases, the normal model and dual zone model will not have the blower resistor in the same area. And the first problem i see so far from what has been told to you and the pictures there, i am guessing you are looking in the wrong area, cause according to this video i found especially on mountaineer blower motors, it is located under the hood with the evaporation canister. Here is the link to the whole video series that cover removal and reinstallation of the blower motor and evap core: http://www.ehow.com/videos-on_493_ford-removing-replacing-heater-core.html

Hope this helps you out! If not write me back and i will continue digging dirt on you model of SUV, since it does seem to be one of the better documented model on the net, so shouldn't be to hard to find more helpful info if needed.

Posted on Jul 12, 2009

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  • Gilbert Labont?
    Gilbert Labont? Jul 13, 2009

    Well one thing is for sure, the resistor pack will have the side that resembles a credit card as you stated inside the air ducts of the blower motor, either directly inside the assembly requiring you to take it apart as if you were changing the motor itself, or in the duct coming out of the blower motor somewhere. Could also be on the ducts in the middle of the dash requiring you to take the radio/climate controls section out of the dash. Still looking for a good enough picture to give you though and I assure you I will not rest until i find a decent enough photo that indicates the clear location of the resistor pack.

  • Gilbert Labont?
    Gilbert Labont? Jul 13, 2009

    After much searching and finding mostly descriptions and wiring diagrams with only wire colors to go with, i took one of your photos from here and edited it to show you where the resistor pack is according to all the info I found.




    Most people said they had to lay down with their head against the firewall while looking upwards towards the roof to see the resistor pack and be able to unscrew it from there. Should be a tight fit and maybe a bit tricky but it's only 2 screws so shouldn't be too hard with a bit of patience and dexterity.

  • Gilbert Labont?
    Gilbert Labont? Jul 13, 2009

    I have checked again and again and yes it does seem that the resistor pack is in that box/part. Here is another picture that I found which i do believe relates directly to your model. You can copy it to your computer and zoom in on it a bit cause it is a bit small to clearly see everything as it is just a screen shot of a PDF document. It seems to be located right under the bigger harness with 2 big wires coming out that we see on your picture and the i pointed out. IE the box has 2 harnesses and the one that is kind of hidden and has 4-5 smaller wires is the one connected to the resistor pack.

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The resister is right behind the 4X4 control module (if you have a 4X4). Open the glove box and squeeze the sides of the box in. It will drop down out of the way. You will see the 4X4 CM and it is well marked (assuming you have a 4X4 rig). The resister is the thing with an electrical connector almost directly behind the module. Before removing anything unhook the battery ground clamp. I can't remember for sure if you need to remove the 4X4 module to get the resister out. If so, the 4X4 module can be removed by undoing the one screw that comes up from the bottom on the bracket it is mounted to. No need to undo the two screws that hold it to the bracket. Undo the connector on the resister and remove the screws that hold it in place. Let me know if you have any other questions and thank you so much for using FixYa!
Where in the heck is the blower motor resistor - ff90a16.jpg

Posted on Jul 11, 2009

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  • Keith Heavilin
    Keith Heavilin Jul 11, 2009

    Is there any way that you can post a picture of what it is that you have so I can know what you are talking about? Thanks, Keith.

  • Keith Heavilin
    Keith Heavilin Jul 11, 2009

    Have you taken the old resistor out yet? I would also like to see a picture of them next to each other if possible. You've got me a little stumped right now. From what you are saying, you should take the old resistor out and put the "credit card" end of the resistor in first and then screw the new one back in. Let me know. Thanks, Keith.

  • Keith Heavilin
    Keith Heavilin Jul 11, 2009

    Do you have a picture of the parts side by side, I can't really see anything in the other picture because they make it so small.

  • Keith Heavilin
    Keith Heavilin Jul 11, 2009

    The part that you have is correct and for some reason my research books were pointing to it in the location that I told you and it is obviously not correct. Give me about 10 minutes and I will have this solved for you. I apologize profusely!

  • Keith Heavilin
    Keith Heavilin Jul 11, 2009

    I must apologize again. I have done some extensive research into this and everything that I am finding shows me that the resistor should be where I said. Obviously since it's not I'm really vexed. One of the things that I was reading said that some of the 2005 Mercury Mountaineers/Ford Explorers don't use a resistor and instead use a blower motor speed control unit. They didn't really say why some use one thing and some another but that is what I found. I assume that the part you sent me a picture of is coming from the blower motor so I would think that you might have a blower motor speed control unit. I can't find that unit online at Auto Zone so you might have to call a Ford dealer to see about getting the part. I would suggest looking at the part before you buy it to make sure it looks like the part you have on the vehicle. All of this being said, I'm sorry that I haven't been able to help you out, but not from a lack of racking my brain over this. Good luck and you also have the option to repost and see if another expert might be able to help you with this. Sorry again and thanks for using FixYa!

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1 Answer

I have a 2005 Mercury Mountaineer Premier 4.6 liter. A/C blows cold however the blower in dash cuts on and off thru dashboard from 0-50 works fine above the blower in dash doesn't blow.


Strange for blower but not unusually for compressor. The usual high or low limit switch would cut off the compressor but not the blower. Maybe check alternator and battery voltage to see if there is a voltage problem. The blower motor resistance switch is problematic but I have not heard of one acting like yours.

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My 2003 mercury mountaineer the air just stopped.no power it seems.wont do nothing.make no sound at all.it was working fine


You mean no air blowing out of the vents ? Blower motor maybe , blower motor relay , high speed control relay , blower motor resistor . Do you know to test automotive electrical circuits , how to read a wiring diagram so you know what circuits to test ? Doesn't matter that it was working fine , that's the nature of automotive electrical systems . Your best bet mite be to take to a repair shop. But if you care to try and fix it yourself there are videos on youtube.
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Aug 18, 2017 | Mercury Cars & Trucks

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Why would my fan not be blowing hot or cold air?


You could have a relay that is bad , Blower motor relay in the under hood fuse/relay box. Or the blower motor itself could be bad . This is where you need to get a wiring diagram an a component location chart an a DVOM digital volt ohm meter an do some testing . The blower motor resistor , is this the part you changed ? If you haven't high blower operation either it couldn't be the blower motor resistor .

Oct 23, 2015 | 2002 Mercury Mountaineer

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Need help find the location of blower resistor


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Sep 20, 2014 | 2000 Mercury Mountaineer

2 Answers

1999MERCURY MOUNTAINEER AC BLOWER ONLY RUNS ON HI SPEED? WHAT TO DO?


blower motor resistor is burnt up
located upsteam in air plenum from blower motor
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locate motor then you should spot resistor close by

May 09, 2011 | 1999 Mercury Mountaineer

1 Answer

Need to locate the motor blower resistor for my 1999 mercury mountaineer, it has dual air, the resistor for the back is fine but the one in the front is bad and i cannot locate it. Please help.


If you have a manual system, you have a resistor. If electronic, you have a blower motor speed controller. Please rate if this helps.

here is info:

Control System Outputs-Manual A/C
Blower Motor Switch Resistor
The heater blower motor switch resistor has the following features:
  • The assembly is located on the evaporator housing in the engine compartment.
  • Three resistance elements are mounted on the resistor board to provide four blower motor speeds.
  • Depending on the heater blower motor switch position, series resistance is added or bypassed in the blower motor circuit to decrease or increase blower motor speed.
  • An overheating protective device (thermal limiter) will open the resistor coil circuit when the temperature reaches 121°C (250°F) interrupting the blower motor operation in all speeds except HI.
  • The thermal limiter cannot be reset and is not serviceable.
Control System Outputs-EATC
Blower Motor Speed Control
The blower speed control is located on the evaporator housing in the engine compartment.
  • The function of the blower motor speed control is to convert low power signals from the electronic automatic temperature control module to a high current, variable ground feed for the blower motor (18527).
  • The blower motor speed is infinitely variable and is controlled by the electronic automatic temperature control module software.
  • A delay function provides a gradual increase or decrease in blower motor speed under all conditions.

Jan 10, 2011 | 1999 Mercury Mountaineer

1 Answer

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This is the Blower Motor Resistor that has gone bad. The sure sign is only Off and High working.
This is located near the Blower Motor and is easily accessed, removed and replaced.
Autozone.com, Part #JA1504 for around $25. This has a photo of the part and a Job View Diagram to help you in your endeavors.

Let me know if this helped...Thanks for using FixYa.com!

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1 Answer

Heater/AC Blower Resistor Module


it goes just to the right of the blower motor.

Mar 27, 2009 | 2002 Mercury Mountaineer

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