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auto temp control innoperative

Discussion in 'Stock 1995 - 2001 Explorers' started by hotrod31, August 6, 2011.

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    1. hotrod31

      hotrod31 New Member

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      im having trouble with my auto temp control, ive done the whole blend door mod thing witch gets me by for now and it does not feel like broken door and it sure would be nice to control the temp again, ive already tried a new blend door actuator but it still does not work. the code it gives me is 21, im sick of dealing with this, can i change it over to maual control fairly easily?
       
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    3. mritz

      mritz New Member

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    4. hworksinc

      hworksinc Active Member

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      That's for a newer version of the EATC system. For the 1998-2000 Explorer (possibly 1995-1997 as well), this is the proper troubleshooting information. This is from http://www.cardomain.com/ride/296394/2002-ford-ranger-regular-cab/page-14

      He did a conversion from manual to EATC in his Ranger using the Explorer EATC system. There is a very good description of the system and components. There are numerous threads around here that discuss EATC troubleshooting and installation. There are also many threads discussing manual-to-EATC conversions and EATC-to-manual conversions.

      There's no error 21, but my guess would be a problem with the blend door actuator or wiring. Did you get the proper actuator for the EATC system?

      From http://www.cardomain.com/ride/296394/2002-ford-ranger-regular-cab/page-17 :
      "Advanced self-test mode

      The EATC has an advanced self-diagnostic test mode. A great description of it can be found here on the P71 interceptor site I mentioned previously. What he's posted is a direct "cut and paste" from the Ford service manual. I'll paraphrase here and add some additional codes you may see not mentioned in that document.

      Basically, what you do is press and hold the OFF button on the head unit, then press FLOOR while still holding down OFF. Now quickly release both buttons and press the AUTOMATIC button.

      At this point a little line will appear to rotate in the middle of the display. This indicates testing is in progress.

      The test can take what seems to be a long while when you're waiting for it! Just let it run and don't worry.

      At the end, the display will begin flashing numbers, or it will simply light up everything on the display and halt.

      If only "888" appears for the number, and everything else on the display is lit up, then you have passed the advanced self-test! Congratulations! You can now proceed with the installation.

      If there are numbers, write them down as they appear. Here's what they mean:

      022, 024 - Blend door actuator shorted

      025 - Blend door actuator not responding properly

      030 - cabin temp sensor shorted (either wiring or bad sensor)

      031 - cabin temp sensor not connected or failed (open circuit)

      040, 042 - outside (ambient) sensor shorted (wiring or bad sensor)

      041, 043 - outside (ambient) sensor not connected or failed (open circuit)

      050, 052 - solar radiation sensor shorted

      115, 125 - bad/no data from vehicle network (you'll get this always testing outside the vehicle)"
       

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