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  #1  
Old 12-06-2017, 03:12 PM
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Problem EATC Heat Coming Thru Vents

I have a 2004 Marauder and today I noticed my heat comes thru the vents when I choose either the floor, defrost, or floor and defrost buttons instead of coming through the floor or dash like it should. A few years ago I had a problem where my air conditioning came out of the floor and dash and nothing came out of the vents. I recall someone suggested I replace the washers in the EATC and sure enough that fixed the problem. I was wondering could this be the same thing again since I read elsewhere in another forum that the washers tend to dry out over time and not seal properly. Also noticed when I turn on or off the engine it sounds like a door opening or trying to open or close under the dash on the passenger side. Don't know if that has anything to do with this problem. Any suggestions on what the problem may be and if the washers I think last time a club member said you get them from a supplier in New Jersey. If someone could provide me with where I get the washers that would be most appreciated. Thanks ever so much. Have 219 K on the Marauder and still drive it and love it. Thanks for your help in advance.
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  #2  
Old 12-06-2017, 04:47 PM
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You may want to reach out the FastBlackMerc, he is an expert in all thing involving the HVAC system.
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  #3  
Old 12-06-2017, 06:01 PM
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FBM has an excellent repair thread with all diagnostic and repair steps. Its a sticky I believe
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Old 12-06-2017, 06:10 PM
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Washers? If you meant the o-rings, as long as you used silicone ones they should not need replacement again.

The "door closing" sound on start-up or shut-down is normal.

Having air coming from the vents all the time means either the vent door actuator is bad or the vent door itself is disconnected or broken...not an uncommon issue.
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Old 12-07-2017, 09:05 AM
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Problem EATC Heat Coming Thru Vents

This happened to me two years ago, after some auto body hacks in town beat on the car for a week fixing the right front quarter panel. I was able to fix it by resetting the EATC with the self test. The system ran through its cycle, there was a lot of thumping under the dash which I took to be the blend door opening and closing, then everything started blowing normally.

Try this first anyway:

“Key on, engine running: Press OFF and FLOOR simultaneously, then press AUTOMATIC within 2 seconds. The EATC will have to run some tests and do some thinking. It may take up to 30 seconds. Soon it may display some codes. Write these down. To exit self test press DEF.”

Look for error code 024 which is a fault in blend door calibration during the test, or code 025 which is an intermittent fault in blend door calibration. There are a bunch of others from 030 up to 125, but I don’t have all their descriptions.

Hopefully this will reset it for you like it did mine, but if not at least you gave it a shot and might get more info.


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Last edited by Svashtar; 12-07-2017 at 04:42 PM.
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  #6  
Old 12-07-2017, 09:40 AM
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Quote:
Originally Posted by Svashtar View Post
This happened to me two years ago, after some auto body hacks in town beat on the car for a week fixing the right front quarter panel. I was able to fix it by resetting the EATC with the self test. The system ran through its cycle, there was a lot of thumping under the dash which I took to be the blend door opening and closing, then everything started blowing normally.

Try this first anyway:

“Key on, engine running: Press OFF and FLOOR simultaneously, then press AUTOMATIC within 2 seconds. The EATC will have to run some tests and do some thinking. It may take up to 30 seconds. Soon it may display some codes. Write these down. To exit self test press DEF.”

Look for error code 024 which is a fault in blend foot calibration during the test, or code 025 which is an intermittent fault in blend door calibration. There are a bunch of others from 030 up to 125, but I don’t have all their descriptions.

Hopefully this will reset it for you like it did mine, but if not at least you gave it a shot and might get more info.


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Here is the exact procedure:

Electronic Automatic Temperature Control Module Self-Test Procedure


Interior of the vehicle must be between 40 - 90 degrees while running the test. If not you may get false in-car temperature sensor errors.
•The EATC module self-test will not detect concerns associated with data link messages like engine coolant temperature or vehicle speed signals. A NGS tester must be used to retrieve these concerns.
• The EATC module self-test will detect concerns in the system control functions and will display hard diagnostic trouble codes (DTCs) in addition to intermittent diagnostic trouble codes for concerns that occur during system operation. The vehicle interior temperature should be between 4°-32°C (40-90°F) when carrying out the self-test. If the temperatures are not within the specified ranges, false in-car temperature sensor DTCs will be displayed.
• The self-test can be initiated at any time. Normal operation of the system stops when the self-test is activated.
• To enter the self-test, press the OFF and FLOOR buttons simultaneously and then press the AUTOMATIC button within two seconds. The display will show a pulse tracer going around the center of the display window. The test may run as long as 30 seconds. Record all DTCs displayed.
• If any DTCs appear during the self-test, follow the diagnostics procedure given under ACTION for each DTC given.
• If a condition exists but no DTCs appear during the self-test, refer to the Symptom Chart Condition: The EATC System Is Inoperative, Intermittent or Improper Operation.
• To exit self-test and retain all intermittent DTCs, push the blue (cooler) button. The control will exit self-test, retain all intermittent diagnostic trouble codes and then turn OFF (display blank).
• To exit the self-test and clear all DTCs, press the DEFROST button. The vacuum fluorescent display window will show 888 and all function symbols for one second. Then, the EATC control assembly will turn OFF (display blank) and all DTCs will be cleared.
• Always exit the self-test before powering the system down (system turned OFF).
• Intermittent DTCs will be deleted after 80 ignition switch ON cycles after the intermittent condition occurs.
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Old 12-07-2017, 12:11 PM
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^^^ that should be a sticky

Do we have a section here, most common issues and how to test and repair?

That would be awesome
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  #8  
Old 12-07-2017, 12:14 PM
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I just had the identical problem you are having OP. The diverter door itself had self destructed and was just laying there. It required the complete removal of the dashboard, and a very difficult home repair. If I had to do it again, I would have bought a new HVAC box. Good luck
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Old 12-07-2017, 12:30 PM
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The diverter door hinge is made of plastic, just like you'd find on a beer cooler.
After so many cycles, they fail. Absolutely stupid design.
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  #10  
Old 12-07-2017, 01:10 PM
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Quote:
Originally Posted by Turbov6Bryan View Post
^^^ that should be a sticky

Do we have a section here, most common issues and how to test and repair?

That would be awesome
It is!

Interior Electrical/Electronic forum
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“When you can’t make them see the light, make them feel the heat.”
Ronald Regan

"The only way to deal with the Islamic State - these blood thirsty, blood-drunken, terrorists -
is to kill them, keep on killing them, until you kill the last one, then you kill his pet goat."

Lt. Colonel Ralph Peters

“Be polite, be professional, but have a plan to kill everybody you meet.”
"I come in peace. I didn't bring artillery. But I'm pleading with you, with tears in my eyes, if you **** with me, I'll kill you all"
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Old 12-07-2017, 01:21 PM
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Quote:
Originally Posted by Zack View Post
The diverter door hinge is made of plastic, just like you'd find on a beer cooler.
After so many cycles, they fail. Absolutely stupid design.
Had the broken blend door on my '98 Ranger. Bought a kit to replace it that required you cut the bottom of the HVAC case. I replaced the blend door actuator while I was in there.
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Ronald Regan

"The only way to deal with the Islamic State - these blood thirsty, blood-drunken, terrorists -
is to kill them, keep on killing them, until you kill the last one, then you kill his pet goat."

Lt. Colonel Ralph Peters

“Be polite, be professional, but have a plan to kill everybody you meet.”
"I come in peace. I didn't bring artillery. But I'm pleading with you, with tears in my eyes, if you **** with me, I'll kill you all"
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  #12  
Old 12-07-2017, 01:23 PM
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Quote:
Originally Posted by fastblackmerc View Post
Had the broken blend door on my '98 Ranger. Bought a kit to replace it that required you cut the bottom of the HVAC case. I replaced the blend door actuator while I was in there.
But in my case, it was not the blend door. It was the door that decided vent or floor.
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