So I'm getting a weird intermittent sucking sound from the frontish area of my DCT.
2012 DCT 135i. Bought the car used recently and the DCT pan was pretty wet so I knew it was due for a service ASAP. Only drained about 4L of fluid from the pan. Did both filters, new pan, and gasket. Took ~6.5L of fluid after oil balancing with ISTA. FCP kit came with 7 so I figured this was good.
Basically immediately it started making a weird intermittent sucking noise. It sounds like a pump ramping up and down every 4ish seconds.
Google led me to
a thread about the sucking jet pump and I thought I had my smoking gun. Dropped the pan again and sure enough, the ball in pump had flipped 180 deg. New one in, oil balance again, and the noise persists.
Here is a video of the noise.
In person it sounds more like fluid sucking past a flapping seal or something rather than metal on metal like it kinda does in the video.
I've searched around but couldn't find anyone with an intermittent noise like this.
Some have suggested that 6.5L is not enough fluid for the trans, since the full capacity is around 10L. I have no idea how much was in after 85k miles, so I might try putting some more in slowly and monitoring, but that's all I got.
Thank you!