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I'm not as familiar with the 4.2L Essex routing....the V8 modulars.. yes. You have a cold climate system/heated PCV, throttle body and IAC. The system is meant to keep all that from icing in below freezing temps and/or thaw upon start quickly.
The line marked in blue is the coolant by-pass hose. The v8s route from the front of manifold back to the heater core hardline. That's coolant.
Line marked in green is what robs the heat routing that to said components
The differences I recall for the 4two's thru the years, is PCV locations and coolant tree/ line intersect. Which changed up routing between the different model years.
As long as you understand what it is suppose to do, you should be able to figure it out regardless.
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The Ebay links user BB posted up are not Cold climate systems or heated PCV assembly's. Those are direct systems which are different.
Actually, the 2003 link is a hose for a heated PCV, like on mine. The hose connects to a heated PCV valve at the intake manifold and fits through a grommet at the valve cover.
Here's a listing for the heated 2000 PCV valve. There's a nipple for a hose. Still not clear what's going on in the back with the 3 way connection. Two PCV valves?
Actually, the 2003 link is a hose for a heated PCV, like on mine. The hose connects to a heated PCV valve at the intake manifold and fits through a grommet at the valve cover.
Here's a listing for the heated 2000 PCV valve. There's a nipple for a hose. Still not clear what's going on in the back with the 3 way connection. Two PCV valves?
Not two PCV's... that I'm aware of anyway lol. Like I said earlier, not as familiar w/the 4twos. Sounds like they may of done something different for 02/03 with that motor. The hose with the insulator jacket in the second ebay link for that model is PCV yes, but it's the breather side, which is normally separated from the PCV valve assembly side. PCV valve assembly's, non heated/heated are usually passenger side valve cover. Valve installs into the valve cover itself.
The breather side PCV line is opposite side (drivers side valve cover). Connects to a grommeted fitting at the valve cover. From there, that line only, routs directly to air intake (just before the throttle body, on the v8's anyway). Yea the 4twos are somewhat different, very different, - specially if your saying the breather side is also the valve side or part of the same assembly on that 03....now that's different lol.
Searched around a little for a complete assembly being marketed or a service manual display. Couldn't find one with ALL hoses complete. Not for the 4twos in this thread anyway. That would of helped a bunch.
There are three PCV version for the 10th gen 4.2's. There was a thread on here a while back (might be the one I posted earlier) that went over it. Seems like the all of 97/98's had a PCV that was not heated, and sat in the valve cover. Then they went to an either heated or regular PCV (same as the 97/98) that also sat in the valve cover. In about 2002, they all were heated, but resided in the intake manifold area (bolt in). The diagram that I posted is the 02-04H style.
EDIT: According to Rock Auto... looks like 97-99 all were not heated rather than 97 & 98 as I said above.
Last edited by white89gt; Oct 28, 2021 at 08:45 AM.
The 2003 hose I showed is the same as the one on my rig, which also has the heated valve at the intake manifold. I have had the hose in my hand, it's on the passenger side, it is the vent hose, not the fresh air hose. I think that it is insulated to combat the freezing/condensation problem.
Here's an interesting thread, and the one it links to. Kind of looks like two valves. The one in the back of the manifold is a big bulky thing. Never seen one like it, but it does look like two coolant nipples and a gases nipple.
Ford sure did spend a lot of time and effort on the 4.2. Constant changes over the years.
The 2003 hose I showed is the same as the one on my rig, which also has the heated valve at the intake manifold. I have had the hose in my hand, it's on the passenger side, it is the vent hose, not the fresh air hose. I think that it is insulated to combat the freezing/condensation problem.
Yea there's no fresh air hoses factory....although it can be done lol. And your correct, the insulator helps with icing.
And none of the three that I posted look like that one BBXL posted.
Very weird. Ford does some head scratchers sometimes.... like in 2004 when they finished out the year using a 3.9 V6, when 94 to 03's all had a 3.8 in them. Then in 05 (new model year) they used the 4.0 V6.
