I hate being told when I am looking for information to read the manual. But, the fording stuff is one of those topics where a look through the -20 will help a lot. It also will enlighten you on the "why" for a lot of the plumbing under the hood. Plus, if you try to follow the vent lines to all the drive train parts, I would imagine at least one of yours is broken off and just flapping in the breeze.

If you print out all the manuals, put them in seperate 3 ring binders and then put them next to your tv watching chair. You would be amazed at how much stuff you didn't know just leafing through them while watching something mindless like a football game.