EATC Woes (Replaced O-Rings)

[PyrBliss]

Just picked up my first Marauder. AC didn't work and nothing came out of the vents (at any fan speed). Going through this before with my Grand Marquis, I grabbed a new blower resistor motor. Yay got air coming out of the vents again. Crap only defrost though. Grabbed some flurosilicone 007 size O-rings and much to my surprise I still only have air coming out of defrost?

I switched the EATC from my GM which had the same O-rings replaced and voila - I have air from all vents again. Do EATC just go bad? Ran self-test. No codes? I'm stumped. Before I buy a new one, I just want to make sure there isn't something else I should be trying? It has to be the EATC itself since I switched it with a working unit and it solved the problem. Thank you in advance.

[Zack]

My guess is an improper repair

[PyrBliss]

I thought about that. Not sure what though since I successfully fixed my GM EATC the exact same way with the same parts. I will pull it out and re-do. Thank you.

[fastblackmerc]

My guess is an improper repair

Most likely or bad electronics or cracked housing.

[PyrBliss]

Thanks. I will pull it out tonight after work and give it a more thorough look over. Will report with my findings.

[Merrill]

I have an extra if needed.

[PyrBliss]

I have an extra if needed.

Thanks man. After tonight if I still can't figure the issue out, I'm taking you up on that offer. PM me with a price.

[Chayton]

I just changed my o rings and it didnt work Wonder what I did wrong

[RF Overlord]

I've heard of the internal vacuum manifold, the part the solenoids attach to, being porous or cracked. Someone here fixed theirs with epoxy.

Or it could be an electronic issue and the solenoids aren't being triggered.

[fastblackmerc]

I fix them with epoxy.

[RF Overlord]

I just changed my o rings and it didnt work

What was the original problem? Usually when it's the o-rings you find the system changing from dash vents to defrost when accelerating or when going up a hill, then restoring to vents when you let up on the gas. If it's stuck on defrost full-time, then you have other issues, like the OP.

[PyrBliss]

Update:

Discovered a spring missing in one of the vacuum actuators. Not sure how I missed that when I initially replaced the O-rings.

Now I just have to find a new spring....

[fastblackmerc]

Update:

Discovered a spring missing in one of the vacuum actuators. Not sure how I missed that when I initially replaced the O-rings.

Now I just have to find a new spring....

I have one if needed. Just pay postage.

[fastblackmerc]

I just changed my o rings and it didnt work Wonder what I did wrong

Take it apart and check everything.

[PyrBliss]

I have one if needed. Just pay postage.

Sweet......Pm sent!