Hi There

I am sick and tired, looking to find the solution. And hope that some one here can help me out. Ford Expedition 2006 Limited edition 5.4, with EATC.

Ac works fine.

Symptoms: Air flow throw windshield.

I start turn on the ac, air go throw windshield and to able to flow trow front, I need to go up with temperature and around 79 degree it will start flow to front, after that go down with the temperature 60 degree, well after I get the highway again the air go to the windshield. I need to play with the temperature bottom to make me happy.

I check all vacuum lines, also the one on back of battery.

Any help really appreciate.

 

If your airflow is deflecting to the windshield, you still have a vacuum leak. Since you have an EATC, you have to include the o-rings in the vacuum solenoids inside the EATC in your list of stuff to check.

 

Vacuum leak, plain and simple. Finding it can be the hard part.

 

This EATC doesn't have the o rings solenoids. Its all electronic.

 

I just hope so one here have the same issue in the past.

 

If it's an 06 Expy, you'd better go look again.

 

correct my ignorance, I take out the EATC and there is not vacuum lines connect to this unit, only wire.

 

The solenoids are in a remote module on your vehicle. Forgot they separated the function.

 

The EATC solenoid control module is located just in front of the center console under the dash. You have to pull the console out to get to it. But before you do all that try running a EATC self test and see if it pops up any DTC codes.

Here's how:

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Electronic Automatic Temperature Control Module Self-Test


The EATC module 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 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 performing 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 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 then press the AUTOMATIC button within 2 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, GO to 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 temperature) button. The control will exit self-test, retain all intermittent DTCs and then turn OFF (display blank).

To exit 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.



Electronic Automatic Temperature Control Module — Retrieve Continuous DTCs

The EATC module will retrieve only continuous (intermittent) 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.

If a condition exists but no DTCs appear, GO to Symptom Chart Condition: The EATC System Is Inoperative, Intermittent or Incorrect Operation.

To exit and retain all continuous DTCs, press any button except DEFROST. The EATC module will exit the retrieve 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 temperature blend door actuators to automatically recalibrate.

Continuous DTCs will be deleted after 80 ignition switch ON cycles after the intermittent fault occurs.



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Post back with any codes retrieved....



-Mike