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Discussion Starter #1 (Edited)
If you have an Electronic Automatic Temperature Control (EATC) you can (sometimes) extract information about certain component self test. It is most helpful when attempting to diagnose an input to the EATC. Generally EATC outputs are not tested by this procedure.

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

EATC System self test error code list


024 Fault in blend door calibration during self test

025 Intermittent fault in blend door calibration

030 Self test indicates automatic temperature control sensor shorted

031 Self test indicates automatic temperature control sensor open

040 Self test indicates ambient sensor short

041 Self test indicates ambient sensor open

042 Ambient sensor intermittent short

043 Ambient sensor intermittent open

050 Self test indicates sunload sensor short

052 Sunload sensor intermittent short

115 Intermittent engine coolant temperature signal

125 Intermittent vehicle speed signal

888 End of test

EATC outputs are not tested. The EATC is not capable of "reporting on itself" as faulty. You may get inaccurate reports if EATC module is bad. (Thanks oldtimer35).
 

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The Five hundred only has a button that cycles between floor, dash, and both. Pushing that button with the off, then auto, doesn't work.
 

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Anyone know how to run the diagnostic test for auto climit on a 2005 Five Hundred?

Since there is no "Floor" button, pushing "Off," "Floor," then "Auto" doesn't work. Pushing the floor, dash, or both button thats there instead of the "Floor" button, doesn't work. If you know how to do this, let me know. Codes translate would help also.
 

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Key on engine off, press OFF and DEFROST at the same time then release. Within 2 seconds push the AUTO button.
 
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Key off, key on, off & defrost, then auto didn't work. Tried every combination I could think of on top of that. Nothing worked. Only good thing is it seemed to clear up on it's own. It had rained hard with temp in the 30's, then dropped to 13 degrees that night it stpped working. Apparently ford designs the heater to fail when you need it most. Have new antifreeze and level was okay. Maybe something froze that night.
 

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If none of those work you must need a scan tool to access it then. Or the control head is no good.
 
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