Hey all,

So over the weekend, I relocated my ACD/AYC pump in to the trunk.

When I was bleeding the lines, I noticed that the fluid in from the ACD bleed screw is brownish even though the ATF fluid is red.

The fluid from the rear AYC is red and fresh as I put in the new fluid.

I know that the corrosion of the pump "galvanic corrosion", as I read from another thread, can turn the fluid brown and is bad.

My question is, if the pump is corroded, why would it be brown only from the ACD line and not the rear ACY lines?

 

dang almost 300 views and no one has any input?

well, I kept bleeding the line until the no more brown fluid was coming out.

 

Smart, bleed the brown.

 

I know this probably doesn't help much. My pump corroded and died, when I pulled it out to replace it the fluid inside still looked reddish. I didn't notice any extreme discoloration. To be fair this was at the pump itself, not at the ACD bleed screw.

If you bleed the whole thing does the line eventually run red? When your pump kicks on does it only run for about 5 seconds at start up? It shouldn't take long for it to pressurize the lines.

You could have a separate corrosion issue at the ACD location (although I have never heard of this). I would check all the fittings, run the car for a while (maybe a week or two?) and bleed it later to check the color.

The whole pump setup is a pain in the butt. When it works it's great though!

 

Also, I think if your pump was corroded, you would know it just to look at it. It should look like a frozen dog turd. If it still looks new chances are you are okay. (Individual results may differ)

 

yeah it was only coming out of the ACD bleed screw. Eventually, the fluid was the fresh red color after bleeding. It's working great so far. will have to wait and see. thanks for the input guys.