Follow the hard pipe from the egr valve around to the other side of the block to where it is fastened at the intake end. The last inch or so of that tube is going to be blocked. Keep in mind that the tube goes into the intake manifold further than where the holding plate is. Kinda pia to remove/clean. You can try to disconnect it at the egr end and roto root an old section of speedo cable down into it but it has been my experience that I've never been able to get it to make that last 90 degree turn. I have heard that there is an updated design that does not plug at the intake end.

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Jim