> 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??
>

That's the state of PCV systems today. In order to lower emissions they
run them so near the ragged edge of too little flow to keep the engine
clean that they have to HEAT the PCV air to keep the gookum from
condensing out and clogging it. This is why so many engines die of
"sludge" in the oil these days- the PCV systems are no longer flowing
enough air to keep the internals of the engine as clean as they once did.