Quick EATC question.

[txcntryboi23]

I've noticed lately in my 95 Crown Vic LX with EATC that the air flow coming out of the vents decreases, the longer I drive. From the sound of the Blower Motor, it is working as it should, and doesent decrease in speed, but sounds as if there is something blocking the air passages in the dash. Sometimes doing self diagnostics on the EATC unit will fix it, sometimes I will have to completely shut the car down, to solve the issue. Any advice on where to start looking for my vacuum issue?

[VicCrownVic]

To put the unit in self test mode:
with the key in the on position (run or key on engine off not accessory), simultaneously push the off and floor buttons then within a couple of seconds press the Automatic button.
I always use a page from Lincolns online to remember how to do the self test.



Sounds like it's being blocked? Or is the air coming out of the defrost vents when you wanted it to come out at the panel vents?

A common failure for EATC is o-rings not sealing in the vacuum actuator assembly. Over time the o-rings can become dry/hard and then no longer form a good seal. The system defaulting to defrost is the normal symptom.
I've been told that this wasn't such a problem on the aeros but don't know that for sure. Unfortunately the actuators on the '02 and older assemblies is not easily serviceable like the '03 and newer assemblies. If you can cut and solder a few wires, and drill two mounting holes in the plastic back of the control unit housing, an '03 assembly can be easily be retrofitted.
Replacement of the o-rings on '03 and newer assemblies is much easier. For that procedure there is a very good write up on mercurymarauder.net.

[txcntryboi23]

Well I think I may have found it. After running max ac for a while, I think the door behind the glove box must get stuck part way open, the air from the vents is never redirected anywhere else, it just slowly tapers off, with the blower motor going the same speed. DTC come up 888, every once In a while I will get a 125, or 115. I'll drive it a while today and look more into this and update.

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[txcntryboi23]

Anyone know what this guy is?

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[Kodachrome Wolf]

Anyone know what this guy is?

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Glove box dampener. It prevents the glove box from slamming down on its stops when opened. Later cars lost this item through decontenting.

[txcntryboi23]

Fancy. I found the problem. My ac compressor is running all the time, causing my lines to freeze up. I'm not an ac guy, nor will I try to be an ac guy. No more ac use until she sees the Doc.

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[sly]

if it's freezing up, it's either an almost clogged orifice tube or it's a little low on refrigerant. If the latter, you'll need seals and/or parts.

[gadget73]

Probably the low pressure switch has shat itself. It should drop the compressor out before the evaporator freezes even if there are other problems.

Dirt in the evaporator is a fair bet too. Mine used to have problems with this, but after flushing the crud out of it with a hose some years ago it quit being stupid. Pull the blower motor and you can get some access into the evaporator through the hole. Won't give all of it, but its enough to know if its packed with crap.

Still though, the pressure switch should be cutting the compressor out before it ices up for any reason.

[txcntryboi23]

Agreed. About a month ago I removed about a large coffee can of leafs and debris from the driver side windshield wiper tray, I can only imagine how much junk is behind the Blower motor, as the car sat up for 8 years.

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