AC blow out at Defrost during moderate to hard Acceleration

[86VickyLX]

The newer style puts the vacuum reservoir on the a/c evaporator case itself. Not sure if it's seperable.

[IPreferDIY]

... I think this was the thread you (IPreferDIY) were thinking of: http://www.grandmarq.net/vb/showthre...l=1#post818872
Details of the modifications required are further down in that thread.

Yup, that's the one. I wonder if usage pattern relates to o-ring failure, blend door actuator failure, and/or blend door hinge failure. I leave my EATC at constant settings (vent and occasional A/C in warm/hot weather, floor and occasional defrost in cool/cold weather) rather than rely on the auto function. No issues so far.

Thanks but please do not take your car apart for me, ...

+1. I can check out the guts of an Explorer one at a U-pull yard whenever the opportunity presents itself.

[FordMan77]

Pretty sure it was just tying in the power and ground wires to make it match the old head unit as one of them had an additional pin on the board that the other one didn't.

[EaOutlaw1969]

Well I finally got my o-rings and took my Control head apart. I did find worn o-rings but I also found rust and bad vent filters.
Here are some pictures if your interested.
I inspected the plastic tubes and seats and only found a little bit of debris in them which I cleaned out.
I was able to use my ultrasonic cleaner and emery cloth to clean up the rust and I replaced the filters with some cut down charcoal filter from a air filtration unit.
It was a pain and took a couple hours for the job but at least I know the system should not suck any of the old vent filter in the system.
I was not sure if the rust would interfere with the solenoids or not only two of them were rusted up and were hard to remove yet now they are rust free and coated with some WD-40 to slow down any further rust from forming.
Anyways my AC works great and I should not need to change out my control head for some other unit.
Thanks for the help with this guys.

BTW the last picture shows the vent filter that had fallen apart, I was not sure if bits of that stuff could get sucked up in the system so I changed them out It just took prying the tabs down with a small screwdriver cleaning up the residual and cut a small piece of replacement filter to fit then bend the tabs back in place.

To pull this job off I had to use a small inspection camera to inspect the tubes and seat area for the spring loaded check valve
I also used my ultrasonic cleaner but normal cleaning methods would have worked as well