Not sure about the Pacifica engine but it's probably similar to the Sebring 2.7 since it's a similar function. On the Sebring, there's just one bolt near the top. The tube fits into a hole near the bottom and has a couple of O-rings to seal it down there. To remove the tube, you need to remove the bolt, then pull up on the tube to get it out. It was stubborn, and I needed to use a prybar carefully under the metal strap that the bolt went through. With a little leverage for persuasion, it popped right out.
Clean up the bottom end as well as you can. I searched several auto parts stores but never found replacements for the O-rings so I re-used them. Put a little clean oil on the O-rings before pushing the tube back in place.
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