EATC o-ring repair - How to... with pics.

NavySeabee said:
Guys, if you sent me your mailing address for o-rings, I can't find them!! :(

Somewhere in this house is a package with about 70 o-rings. I must have put them away somewhere they'd be safe. It's driving me nuts! Don't know where else to look and my OCD won't let me quit looking!!

Sorry for the delay.
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Noted. Update us if you find them! I appreciate the effort and gesture.
 
Ingsinve had the out the defroster syndrome for some time. It used to switch automatically. So I thought it was normal. Guess not after reading this thread. My question is, can you use rubber or Viton orings? And if not would anybody like to toss some this way. Thanks
 
Never mind on the orings. I got some on the way. I checked my original orings and all seem pliable. Is there a certain way to vacuum check the solinoid (that doesn't look right) case
 
I want to thank everyone who contributed to this repair. My 2003 Crown Vic LX (136k) had the same problem, (the airflow switching to the defrost vents under low vacuum conditions) and this procedure worked like a charm. The O-rings in my unit were not broken but seemed harder than the newer #007 ones I replaced them with. The whole repair took about an hour and was made even easier thanks to the excellent notes.

If anyone needs some O-rings shoot me a msg and I will send out the remaining ones that I have.
 
Too all those that have contributed to this solution, You are AWESOME! I can finally get the A/C out of the panel instead of the defrost. And for less than $15 bucks vs. the $900 I was quoted. Thank you so much.
 
I'm gonna need to do this mine started do this defrost blowing for a few mins then vents.. hate it.. but I can't seem to find the orings at autozone or oreilys.. online order I guess

Sent from my SAMSUNG-SM-G928A using Tapatalk
 
JoeBoomz said:
Good news is these units are relative easy to find in the junk yard. We took apart one last week and the o rings were hard as rock. They literally broke off when we pried at them.
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I am always at the junk yard, any particular years to look for or are they all the same?
 
airjordan2k8 said:
I'm gonna need to do this mine started do this defrost blowing for a few mins then vents.. hate it.. but I can't seem to find the orings at autozone or oreilys.. online order I guess

Sent from my SAMSUNG-SM-G928A using Tapatalk
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If you PM me your address and I send you some. I found them at McMaster-Carr.
 
Thanks to all the guys who shared their knowledge about the EATC O-ring fix. You're postings of How-To's, pics and part n's really saved me a lot of cash and maybe my marriage too. A shop quoted me over $500 to replace the EATC. And the wife hasn't been happy since the AC stopped coming out of the vents. So its a win win all around. I was able to drive over to McMaster Carr since its local to me, get the O-rings and swap out in just a couple hours. Worked like a charm. Thanks again! Peace...
 
Mine only comes out through the dash vents. No defrost or floor. A/C and heat work fine but only through vents. Anyone else ever have this? O rings ?
 
I hope this is the right place for this. Sorry if this was already covered somewhere.

I replaced EATC o-rings, and now I have new symptoms.

BEFORE o-ring replacement, I had no fan speed control and no vent selection control (hi-speed defrost only). But I was able to control the temperature.

AFTER o-ring replacement, I fully regained vent selection control. But TWO things happened.
1. The fan speed is touchy. I have some control (a lot more than before o-rings), but it still seems a bit erratic.
2. I immediately lost control of temperature control. After plugging the unit back in and testing the vent selection, I tried to change the temp and I immediately heard the blend door motor clicking, then it stopped and all temp control was lost. I reset the code and it happened again. Freon and compressor are good.

So the obvious question: what's going on here? The timing of the o-ring replacement and the new symptoms seems suspect. Why would fixing the vacuum issue within the EATC cause new problems in the blend door motor and potentially the blower motor?
 
04allstock said:
I hope this is the right place for this. Sorry if this was already covered somewhere.

I replaced EATC o-rings, and now I have new symptoms.

BEFORE o-ring replacement, I had no fan speed control and no vent selection control (hi-speed defrost only). But I was able to control the temperature.

AFTER o-ring replacement, I fully regained vent selection control. But TWO things happened.
1. The fan speed is touchy. I have some control (a lot more than before o-rings), but it still seems a bit erratic.
2. I immediately lost control of temperature control. After plugging the unit back in and testing the vent selection, I tried to change the temp and I immediately heard the blend door motor clicking, then it stopped and all temp control was lost. I reset the code and it happened again. Freon and compressor are good.

So the obvious question: what's going on here? The timing of the o-ring replacement and the new symptoms seems suspect. Why would fixing the vacuum issue within the EATC cause new problems in the blend door motor and potentially the blower motor?
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Are the internal connectors (plugs) on the pins in the right orientation?

Are the two electrical connectors on the back of the EATC inserted fully?

Did you kink or disconnect the vacuum hoses?

Did you complete disassemble the solenoids to do the repair and reassembled them wrong?

Did you check the vacuum manifold for leaks?

Did you run the EATC self-test?
 
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fastblackmerc said:
Are the internal connectors (plugs) on the pins in the right orientation?

Are the two electrical connectors on the back of the EATC inserted fully?

Did you kink or disconnect the vacuum hoses?

Did you complete disassemble the solenoids to do the repair and reassembled them wrong?

Did you check the vacuum manifold for leaks?

Did you run the EATC self-test?
Click to expand...

yes
yes
no
maybe
no
yes

When the vacuum hoses are disconnected from the back of the unit, I was getting suction only on the black hose. I assume that's normal?
 
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