Like a lot of folks, I got tired of the air inlet for the PCV from the big air pipe after the air cleaner, puking up oil every once in a while and gumming up the throttle body, so I decided to swap over to one of those cute little filters that go over the inlet on the cam cover. (this is a honda b16 4 cylinder). The factory has that inlet connected with a short little hose to like an 11 mm diameter piece of steel tubing that goes into the air pipe. But that piece of tubing is siamesed for a ways with another piece of steel tubing which has a long hose at either end that goes from the block to the throttle body; since the hose at either end is plenty long enough I just took out the whole thing and used a piece of hose to go straight through, which is when I discovered it's a coolant hose.
So, the question is, why, instead of just running a foot of hose to carry the coolant to the throttle body, do they use a foot of hose to run it through a steel tube siamesed to the steel tube that carries the input air for the PCV and then out another foot of hose? Are they trying to heat the air for the PCV up before it gets into the engine? Are they trying to cool the coolant before it gets to the throttle body? The mechanical stability for the thing is entirely from the PCV inlet connection at each end.
What gives??