If you were like me, using your EATC became frustrating because the air wouldnt vent where I wanted it. The AC started only coming from the defroster. No matter what button I pressed it was all coming from the defroster. Heat, AC.... it didnt matter. Well I did a LOT of research and found out what the problem was. There are solenoids in the EATC. 4 of them. They work on suction and in order to get and keep that suction they put rubber o-rings around the solenoids. After time and weather changes those o-rings become rock hard and then brittle. When that happens the system can not keep suction and the system reverts to the fail-safe which is air blowing out of the defroster. This is how you take off the old o-rings and put new ones on!
You need to remove the EATC module from the car. Thats fairly easy. Pop off the front trim which is being held on by clips, remove 4 screws around the module, unplug the module and remove the hose housing.
Once you have it out it will look like this:
THESE ARE THE TOOLS I USED TO CHANGE OUT THE O-RINGS:
That one tool is a torx head
These are the new O-rings you can order from McMaster Carr located in Elmhurst IL and here online: http://www.mcmaster.com/#contact/=ft6bcg
This is what the rear of the unit looks like:
Use the Torx to remove the two rear screws:
Slide the top panel out and up:
Note the top board has a wire plug (red), plugged into the main board on the bottom half:
Unplug that wire:
This is what the top piece looks like. You want to remove all of the screws!
This is what it looks like when youre ready to remove the solenoids from the plastic housing
Here it is when its taken out. You need to pry back the 2 metal prongs holding in the solenoid. I used a knife. Obviously be freakin careful!
Next there are metal clips on the side. Bend those up slightly.
BEFORE prongs were bent:
AFTER they were bent:
Next pop out the solenoid
This is the solenoid. NOTE the spring (dont lose that!) and the black o-ring that needs to be replaced:
Pry off the old o-ring. This is the solenoid with the new o-ring and old one (black) next to it:
Here is the solenoid with the new o-ring on:
This is what the module looks like with the solenoid popped out:
When putting the solenoids back in, you might have to push fairly hard. Make sure you have the springs in before you put the solenoids back in!!!! Make sure they are seated well. Once you have replaced all of them take pliers and bend the metal clips back to keep the solenoids from popping out while the unit is in use.
Now just reverse the steps you used to take the EATC apart.
Install it back into the car and now you will have a like-new functioning EATC!