i just diaged my first leaking egr cooler or i least hope its the cooler. i found moisture in the egr valve bore. also the hose running from the intake to the degas bottle was causing alot of bubbles in the degas bottle. i tried a block checker on it and after a while it turned clear. it seemed to take more time to get it to change than a 3.8l does...go figure! i also have some pics of a cab i took off and i must admit its easier on the back.