Question about 1997 Mercury Mountaineer

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2006 merc mountaineer intermittent a/c problem

In the first 30 minutes of operation the a/c dampers to the dash shut down and devert all air to the defrost/default mode. After a couple of minutes it will open up the dash dampers and then it shuts down again and back to defrost. After about 20/30 minutes everything operates properly.

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  • nmmazzeo Jan 06, 2009

    I have had this car to a dealer twice last summer and they could not isolate this problem. I would like a second oppinion on this fix

  • nmmazzeo Jan 06, 2009

    0ne more oppinion please

  • nmmazzeo Jan 06, 2009

    so far I have recieved three different opinions and would like another to see if any match. thank you

  • nmmazzeo Jan 06, 2009

    I still don't have two matching solutions.
    please help with another solution. thank you

  • nmmazzeo Jan 06, 2009

    how about a little consistancy on this problem.
    thanks all for your input so far. one more answer please.

  • nmmazzeo Jan 06, 2009

    toyota ed...please continue

  • nmmazzeo Jan 06, 2009

    i can see it toyota ed

  • nmmazzeo Jan 06, 2009

    toyota ed, what do you think about emissionwiz's comment

  • nmmazzeo Jan 06, 2009

    I don't know yet but the car will be going to the dealer tomorow with the info you have given me..thank you for your input

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6 Answers

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  • Mercury Master
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The climate system does use vacuum controller devices to move the various doors inside the dash. They are controlled by the control head as EmWiz stated. But, that does not mean that the devices, or the head is bad, not at this point. Note that the system adds outside air to maintain a set temperature, depending on the inside vs outside temperatures, and the desired setting. Without looking at it, I really hesitate to speculate, as control heads are expensive, and changing the vacuum motors can be very time consuming. If I were pressed hard for a guess, I would venture the hypothesis that the interior air temperature sensor is dirty, dislodges, or the sensor tube may be detached. If your car was in MY shop, I would be looking at the interior air temperature sensor first, vacuum storage second, the vacuum motors third, and lastly, the control head. Please advise if you wish for me to contribute additional thoughts.

Posted on Jan 06, 2009

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  • Toyota Ed Jan 06, 2009

    You clicked on the rating button. I doubt that you can read this...please respond if you can see this message...

  • Toyota Ed Jan 06, 2009

    I tend to agree with Emwiz, he has vastly more experience in this matter. If the vacuum storage method is weak, the motors are not moved/held in the specific position. Then, after the engine is warm, perhaps sufficient vacuum is built up to hold the doors into position. This assumes that the control head is good. Now, if the head is indeed bad, i would expect you to have this issue. I need Emwiz to chime back in and add input about the interior sensor; I may be incorrect, he would know for sure...I just know for a fact that on the vehicles that " I " see, the interior temp sensor is critical to proper operation.

  • Toyota Ed Jan 06, 2009

    Additionally, EmissionWiz is, without question, one of THE best experts here at FIxYa. You can trust him.

  • Toyota Ed Jan 06, 2009

    I digress to EmWiz. His solution should be considered best.

  • Toyota Ed Jan 06, 2009

    EmWiz and I thank you for choosing FixYa to assist you with your problem.

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  • Master
  • 916 Answers

This problem to me sounds like it could be coming from the climate control module or the damper motors though I believe it is the climate control module as the motors turn on and off.

Posted on Jan 06, 2009

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  • Master
  • 1,011 Answers

Sir,

The problem is about "Climate Control Module" or damper motors those are control the distrubition of the air to which way air goes, I mean to head or to foot or recirculation on/off. and the car will be checked what the Diagnostic Trouble Codes (DTC) at the Climate Control System, and according to these DTCs, it will be decided what should be done to solve this problem, maybe one of damper motors will be found as defective.

Thanks
goodluck

Posted on Jan 06, 2009

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  • Master
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I think there is some short circuit in main control board and due to that ac goes to defrost mode.

Thanks for using FixYa.

Posted on Jan 06, 2009

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  • Expert
  • 66 Answers

Your climate control system uses vacuum to open and close doors. you need to look for loss of vacuum to the control panel  

Posted on Jan 06, 2009

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  • Mercury Master
  • 61,203 Answers

I will assume u have automatic climate control, if so u will need to replace control head in the center of dash, that is the module u set for AC heat etc.

Posted on Jan 06, 2009

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  • yadayada
    yadayada Jan 06, 2009

    This is a Vacuum problem, a vacuum signal goes out to the vacuum motors that control functions of vent, floor & defrost or a mix of 2 different modes, this vacuum is switched by a electronic Vacuum control in the auto AC/Heat climate control head, only one other issue will cause this, a weak vacuum supply to the control head from the engine, I am sure that is the 1st thing the dealer would check, I am a 20 year veteran of a Ford dealer service dept and these kinds of problems came to me and one other guy, so i am not guessing, I still contend the problem is the automatic climate controller head assembly.

  • yadayada
    yadayada Jan 06, 2009

    The cabin air temp sensor would not make the system switch modes as u state to the defrost and back,THIS MUST BE SELECTED BY THE DRIVER, So I disagree with Toyota Ed.

  • yadayada
    yadayada Jan 06, 2009

    The interior sensor can cause issues like AC turns off or temp will be erratic, but as I said it will not switch modes to defrost, defrost is the default vacuum control loss mode, that is to say if the system vacuum fails the system will go to defrost, this is for safety. Pull the control head out and check the vacuum connector on the back, with the engine running put a vacuum guage on it (eng vacuum supply) to see if at least 18 inches of engine vacuum are present. On the cabin temp sensor in 20 years I replaces 2, and never on an explorer, of which 100's had AC related problem's

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