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Eatc overhead quit working - 2003 Ford F150 Regular Cab

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Heater fan runs when heater is off.06 ford expoler


Automatic or manual climate control ?
  • The blower motor does not operate correctly - manual climate control
  • Circuitry short
  • A/C blower motor resistor
  • A/C blower motor switch
  • Blower motor high speed relay
  • Go To Pinpoint Test O .

  • The blower motor does not operate correctly - EATC
  • Circuitry short/open
  • A/C blower motor speed control
  • EATC module
  • Go To Pinpoint Test Q .

Pinpoint Test Q: The Blower Motor Does Not Operate Correctly - EATC
Normal Operation Under normal operation, the blower motor control module receives a 1-2 volt signal from the EATC module through circuit CH218 (GN/VT) to determine the desired blower motor speed. The EATC module receives a feedback voltage from the blower motor control module through circuit VH219 (GY) to determine actual blower motor speed. When the highest blower motor setting is selected, the EATC module sends 12 volts to the blower control module through circuit CH217 (BN).
    Possible Causes
  • An open, short to voltage, ground or together in circuits CH218 (GN/VT), VH219 (GY) or circuit CH217 (BN)
  • Blower motor control module
  • EATC module
  • If automatic HVAC system i would suspect Blower motor control module .

Oct 27, 2016 | 2006 Ford Explorer

1 Answer

How do l remove eatc?


EATC Removal and Installation:1. Remove plastic cover on the dashboard (clipped) by carefully praying it with flat screwdriver.
2. Remove the 4 screws holding EATC unit in the dashboard.
3. Pull-out EATC unit, unplug two electrical connectors (push the small pin in the middle of the connector)
4. Disconnect vacuum plug on the back of the unit (two small nuts hold vacuum plug in place).
5. For installation - reverse the removing procedure.
6. Check EATC for proper operation.
ModuleRepairPro.com

Aug 13, 2014 | 2005 Mercury Grand Marquis

1 Answer

Heat and aircondition.My heat and air only work on number 5


Sounds like a "fan motor speed controller" or FMSC.
Either that module has gone out...or we're not getting the signal from the control panel sometimes called the EATC.

Lincoln has an EATC (for electronic air temp control)...GMC has something similar.
There is a way to run a diagnostic test of the EATC but am having trouble finding it for GM models.

If EATC test is done and fails...it will tell you it failed and would need replacing.
If EATC passes...it will tell you it passed and the fan motor speed controller would be at fault.

Usually, when a speed controller fails, the blower motor either doesn't turn OR it runs full blast.
Both parts EATC and the FMSC are expensive.
Since yours is running full blast...at least its providing air.
I'd try to run a diagnostic check to be for sure and maybe your parts might be less expensive and available at your local parts store.

Hope this helps...

Aug 13, 2011 | 2004 GMC Envoy

2 Answers

My air conditioner does not work on my 2005 f150. All the display lights turn on at the same time and none of the buttons will control air or heat. Please advise.


I would start with disconnecting the EATC / EMTC ( Electronic Automatic / Manual Temperature Control ) panel.
776465b.jpg
Open the ash tray, and pull each lower corner out, they are held on with spring clips. Working your way up the center trim panel, there are 6 ( 3 on each side- black circles in the picture above ).
When you get to the top, be cautious, the Passenger side airbag deactivation lamp has small wires on it, don't pull too hard ( green circle above )
On the back of the EATC / EMTC panel are 2 cam over connectors ( blue circles in the picture above ), release the cam tab, and they will disconnect.
When you reconnect it, it will default to off. Next is to run the self test calibration process ( pay attention to the temperature range ).

I have found some times the EATC / EMTC panel will just freeze up, and disconnecting it, and recalibrating it will make it work again. Few of them have not seen a problem again in 2+ years.
Electronic Automatic Temperature Control Module On-Demand Self-Test The EATC module on-demand self-test will retrieve on-demand (hard fault) DTCs only, it will not retrieve continuous DTCs. Continuous DTCs can be cleared when exiting the EATC module on-demand self-test. Make sure to retrieve continuous DTCs by carrying out the Electronic Automatic Temperature Control Module - Retrieve Continuous DTCs procedure before clearing any continuous DTCs.


•The EATC module on-demand self-test will not detect concerns associated with data link messages like engine coolant temperature or vehicle speed signals. A diagnostic tool must be used to retrieve these concerns.
•The EATC module on-demand self-test will detect concerns in the system control functions and will display on-demand (hard fault) DTCs for concerns that are present during the self-test. The vehicle interior temperature should be between 4°-38°C (40°-100°F) when performing the self-test. If the temperatures are not within the specified ranges, false DTCs may be displayed.
•The self-test can be initiated after cycling the ignition switch from OFF to ON. Normal operation of the climate control system stops when the self-test is activated.
•To enter the self-test, press the OFF and DEFROST buttons simultaneously and release, then press the AUTO button within 2 seconds . The display will show a flashing blower icon for 20 seconds , after which all vacuum fluorescent segments will be displayed if there are no on-demand DTCs present. If DTCs are present the EATC module will display "00 00" and then on-demand DTCs. Record all DTCs displayed.
•If any DTCs appear during the self-test, carry out the diagnostic procedure. Refer to the Electronic Automatic Temperature Control Module Diagnostic Trouble Code Index and follow the ACTION for each DTC given. See: Diagnostic Trouble Code Descriptions
•If a condition exists but no DTCs appear during the self-test, GO to Symptom Chart Condition: The EATC System Is Inoperative, Intermittent or Incorrect Operation. See: Symptom Related Diagnostic Procedures
•To exit the self-test and retain all DTCs, press any button except DEFROST. The EATC module will exit the self-test and retain all DTCs.
•To exit the self-test and clear all DTCs, press the DEFROST button. The EATC module will exit the self-test and all DTCs will be cleared.
•Always exit the self-test before powering the system down (system turned OFF). Once the self-test is exited, the ignition switch must remain ON for at least 30 seconds to allow the door actuators to automatically recalibrate.
•Continuous DTCs will be deleted after 80 ignition switch ON cycles after the intermittent fault occurs.

Electronic Automatic Temperature Control Module - Retrieve Continuous DTCs
The EATC module will retrieve only continuous (intermittent and hard) DTCs when carrying out this procedure.


•Retrieval of continuous DTCs can be initiated after cycling the ignition switch from OFF to ON. Normal operation of the climate control system stops when retrieving continuous DTCs.
•To retrieve continuous DTCs, press the OFF and DEFROST buttons simultaneously and release, then press the RECIRC button within 2 seconds . All vacuum fluorescent segments will be displayed if there are no continuous DTCs present. Continuous DTCs are indicated by the presence of the degrees Celsius symbol (°C) on the EATC module display. Record all DTCs displayed.
•If any DTCs appear, carry out the diagnostic procedure. Refer to the Electronic Automatic Temperature Control Module Diagnostic Trouble Code Index and follow the ACTION for each DTC given. See: Diagnostic Trouble Code Descriptions
•If a condition exists but no DTCs appear, GO to Symptom Chart Condition: The EATC System Is Inoperative, Intermittent or Incorrect Operation. See: Symptom Related Diagnostic Procedures
•To exit and retain all continuous DTCs, press any button except DEFROST. The EATC module will exit the retrieved continuous DTCs mode and retain all continuous DTCs.
•To exit and clear all continuous DTCs, press the DEFROST button. The EATC module will exit the retrieve continuous DTCs mode and all continuous DTCs will be cleared.
•Always exit the procedure before powering the system down (system turned OFF). Once the procedure is exited, the ignition switch must remain ON for at least 30 seconds to allow the door actuators to automatically recalibrate.
•Continuous DTCs will be deleted after 80 ignition switch ON cycles after the intermittent fault occurs.

Electronic Automatic Temperature Control (EATC) Module and Electronic Manual Temperature Control (EMTC) Module Cold Boot Process The purpose of the cold boot process is to allow the EATC or EMTC module to re-initialize and calibrate the door actuators. To carry out the cold boot process, follow the steps below.

1.Turn the ignition switch to the OFF position.
2.Disconnect the EATC or EMTC module electrical connectors.
3.Wait one minute .
4.Connect the EATC or EMTC module electrical connectors.
5.Turn the ignition switch to the ON position.
6.Select any position except OFF on the EATC or EMTC module. The EATC or EMTC module will now initialize and calibrate the mode doors. Calibration of the mode doors will take approximately 30 seconds .

May 04, 2010 | 2005 Ford F-150

1 Answer

No air coming out air vents whats my problem i hae a 99 merc ls


If you have the electronic automatic climate control, it's likely that the rubber O-rings inside the vacuum solenoids in the EATC unit are leaking. Usually you'll get cold air only out the defrost vents or floor with this problem.

If you are mechanically oriented, you can fix it yourself. I repaired the EATC unit in my 2004 Mercury Marauder in about three hours.

Complete instructions, including photographs and the part numbers for new O-rings and the dielectric grease for reassembly can be found in the user forums at www.mercurymarauder.net.

This is a manufacturing issue with the EATC head unit, so if you get a new one, get a written warranty. A new EATC unit is around $600.00. The parts to do the work yourself are about $12.00.

Hope this helps!

D.M.

Feb 21, 2010 | 1999 Mercury Grand Marquis

1 Answer

F250 Overhead Didgital computer dimmed then quit


try tapping on it .. it may come back on but it needs to be replaced lcd screen goes out..

Mar 07, 2009 | 2000 Ford F250 Super Duty Crew Cabs

2 Answers

Over head outside temperature gauge and compass has quit.


The overhead console is quite prone to internal failure. Dim, intermittent, or dead displays are a common symptom of an internal failure. We offer a reasonable repair service with a lifetime guarantee. Check it out: www.autoclockrepair.com

Feb 28, 2009 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

1999 F350 overhead message center quit working.


Go to your Junction box fuse panel on the lower left hand side under the dash and look for position #19...You should have a 10amp fuse. replace the fuse.

Feb 12, 2009 | 1999 Ford F350 Regular Cab

1 Answer

Heat


replace the blower motor controller. ford part # 19e624.call your local ford parts store to get it. I am a ford technition and this is a common problem but the new part has been revised so it will last a lot longer. 9 times out of 10 this fixes the problem and a new EATC is not needed.

Feb 01, 2009 | 2002 Ford Crown Victoria

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