Eatc question

grandepau00

grandepau00

New member
My eatc is stuck on defrost (and a small amount coming out on floor). I pulled the unit, took it apart and replaced all four o-rings. When doing this I noticed two of the o-rings were bad (solinoids pulled out way too easily). I put the unit back together and reinstalled it...still stuck on defrost. I drove the car and parked it. An hour later I pulled the unit back out, when I pulled the vacuum lines off, they were still holding vacuum (good sign). I replaced the orings again this time using a little grease and reinstalled. Still stuck on defrost. I ran the diagnostic self test and the only code it has is 041 which is the ambient temperature sensor I believe...any thoughts?

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grandepau00 said:
My eatc is stuck on defrost (and a small amount coming out on floor). I pulled the unit, took it apart and replaced all four o-rings. When doing this I noticed two of the o-rings were bad (solinoids pulled out way too easily). I put the unit back together and reinstalled it...still stuck on defrost. I drove the car and parked it. An hour later I pulled the unit back out, when I pulled the vacuum lines off, they were still holding vacuum (good sign). I replaced the orings again this time using a little grease and reinstalled. Still stuck on defrost. I ran the diagnostic self test and the only code it has is 041 which is the ambient temperature sensor I believe...any thoughts?

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Click to expand...
The only things it could be are:

O-rings

The electronics inside the EATC are bad
 
Thanks for the feedback. I searched YouTube and the only reset procedure I found was for newer Ford's, it doesn't work with the older ones. If the electronics were bad, wouldn't it generate a code?

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I could never get the self test to work on mine when the unit was still operable. The electronics finally went south and I had to buy a new used one.
 
grandepau00 said:
Thanks for the feedback. I searched YouTube and the only reset procedure I found was for newer Ford's, it doesn't work with the older ones. If the electronics were bad, wouldn't it generate a code?

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Click to expand...

Not necessarily.
 
Mine had same symptoms a couple years ago. Stuck in a new eatc, didn't solve. Put the old back in and replaced the blower motor resistor, been working just fine ever since. I had always understood if the resistor went out you'd just lose speed control across the spectrum, but mine took out all functions other than the one...
Good luck.
 
jlangmaid said:
Mine had same symptoms a couple years ago. Stuck in a new eatc, didn't solve. Put the old back in and replaced the blower motor resistor, been working just fine ever since. I had always understood if the resistor went out you'd just lose speed control across the spectrum, but mine took out all functions other than the one...
Good luck.
Click to expand...

I think I need to try a different unit, all of the blower speeds and blends work fine.

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