[Wansu]

The Vehicle: 2005 F-250 6.0
The Problem: The heater blend door actuator is not getting power
What I tried:

• All I had was cold air even when I set the temp to 90.
• I replaced the actuator and it didn't work.
• I removed the cover in front of the heater core, and with the actuator out, I switched the door so it just blows heat since it is getting cold.
• I reinstalled the actuator and tested once more and now all I have is hot air.
• I don't think the actuator is getting power.
• I searched for a reason and couldn't find one.
• I checked fuse #5 and it is ok.

Can anyone give me some hints on why the actuator is not getting any power? Thanks.

Wansu

 

[CarParts.com]

Hello,

From your description, I'm guessing you have an automatic climate control system. The actuator contains a reversible motor and a potentiometer. The EATC module will apply power to one terminal to move the actuator in one direction and power to the other terminal to move the actuator in the other direction. Does the actuator not get power in either direction? Have you checked with a test light or multimeter?

 

[Wansu]

Hello,

From your description, I'm guessing you have an automatic climate control system. The actuator contains a reversible motor and a potentiometer. The EATC module will apply power to one terminal to move the actuator in one direction and power to the other terminal to move the actuator in the other direction. Does the actuator not get power in either direction? Have you checked with a test light or multimeter?

Thank you. I was afraid no one would respond. I installed a new actuator. I have not checked with a multimeter but I know it does not respond to either direction. If it isn't getting power, and I will check this weekend, does that mean I need to replace the eatc?

 

[FordDoctor]

EATC is the electronic HVAC controller - it will have a digital display with dual temperature control. Manual HVAC will have knobs for heat and temperature. Since you don't know what that is I will ASSUME FOR NOW you have the manual - please correct me if I am wrong.

Test for battery voltage at the white/violet wire at the blend door actuator (fuse F2-24 @ the BJB) and test for ground at the black wire - use a chassis ground or the battery negative terminal for initial testing. I know you have checked but do it this way - humor me.

 

[Wansu]

EATC is the electronic HVAC controller - it will have a digital display with dual temperature control. Manual HVAC will have knobs for heat and temperature. Since you don't know what that is I will ASSUME FOR NOW you have the manual - please correct me if I am wrong.

Test for battery voltage at the white/violet wire at the blend door actuator (fuse F2-24 @ the BJB) and test for ground at the black wire - use a chassis ground or the battery negative terminal for initial testing. I know you have checked but do it this way - humor me.

Thanks for being patient. Electrical is my deficiency. I tested the fuse and it is good. I have been pulling my trailer with the tow haul and its been fine and on the same fuse. Thanks for letting me know which one to check. I have a digital display and this is what I did.
I tested each pin with the multimeter. Orange, blue, and red(3rd pin) had a current of ~4.5 on the multimeter set at 20 DCV when I turned the temp up and down. The red wire on the end never showed a current. I wasn't sure how to test for ground as there is no black wire. Thank you for the help.

 

[FordDoctor]

The pictures provide a lot of needed detail - you have EATC so things are different where diagnosis is concerned. A scan tool would be BEST for this if you have one however the EATC control head has self test capabilities. Restore all connections first then you will need to clear all codes (DTCs) before continuing because you have likely caused codes by disconnecting things with the ignition on. Read through these self test procedures to see how to clear memory codes - then operate the system and then repeat the self tests and code retrieval.

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 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, 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 PANEL buttons simultaneously and release, then press the AUTO button within two 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 (ºC) 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.

 

[Wansu]

...

Thank you FordDoctor. This is challenging but I am up to the task. I have a ScanGuage 2 with all the Superduty options programmed in. Will this read the codes you mentioned? Thank you.

 

[bismic]

The Scangauge II is a VERY poor code reader.

 

[FordDoctor]

Thank you FordDoctor. This is challenging but I am up to the task. I have a ScanGuage 2 with all the Superduty options programmed in. Will this read the codes you mentioned? Thank you.

I only have experience with OEM diagnostic equipment so you are going to have to rely on others here to assist you. That is why I gave you the instructions to use the EATC self diagnostic functions.

 

[Wansu]

The Scangauge II is a VERY poor code reader.

I have it to monitor the engine while pulling the RV. I always wondered about it's code reading ability. Thanks for the info.

 

[bismic]

I have a Scangauge II. It is (ONLY) good for reading engine PIDs

 

[Wansu]

Electronic Automatic Temperature Control Module Self-Test

Electronic Automatic Temperature Control Module — Retrieve Continuous DTCs

Thank you FordDoctor for the information on the self test. I performed the test and was presented with 2 flashing numbers. 22f then 66, over and over until I exited the test. I looked for a list of eatc codes Reference: - Electronic Automatic Temperature Control Codes and neither number was listed. The vacuum pump on the passenger side of the engine compartment started making lots of noise. I replaced it but the climate problems still exist and while testing found more. I can put the air on front vents but as soon as I hit the circulate air button it switches to defrost.

 

[bismic]

duplicate post - deleted