Do you have the 2.7 or 3.2? The heater core supply plumbing takes slightly different parts depending on which engine. Is the part you're talking about hard plastic or rubber? Can you supply a photo?...Also, what about that wierd plastic piece that comes off the pipe behind the engine goes into a tee then the heater core. Do I have to go back with that? can't seem to find the right one.
Yes, the rear portion of number 12 is the quick connect that goes onto the end of the metal pipe, and the barb end connects to a short hose with one end of the tee fitting.That looks like some kind of quick disconnect. I wish I could see a photo of how it all was hooked up fom the factory. So - the order of the fittings was the metal pipe from under the intake -> that fitting -> the tee -> heater hose to heater core? . . . and then the smaller rubber hose from the center of the tee to the coolant reservoir.
So the thing circled in red is that plastic fitting?:
View attachment 41999
I don't remember any part that looks like that. My 2.7 was in a '99, but I would expect the '98 and '99 to be identical for that area. (I had a '98 too, but with the 3.2. I wouldn't expect that to be significantly different for the 3.2 either.) I did re-work all of that on both my cars with a hard plastic tee and the silicone heater hose like I mentioned (I also added a heat exchanger that the factory added starting in 2000MY spliced in-line with that smaller diameter rubber hose to heat the PCV hose gases), and that was 15 or 20 years ago, so if what you show is what I had from the factory before that, no surprise if I don't remember it.
No, If I have to do so, I will just slip the hose over the end of the pipe and clamp it. the only thing I can figure is that since it is the inlet line to the core, having the fitting allows for a quick flush of just the core.OK - I missed seeing where you said the black one was for a Ford.
Looking at the photos in the 2 ebay auctions, it appears that the quick disconnect does not come with the item 12 assembly, which would mean someone added it to your car, or Chrysler maybe decontented it at some point in production. It doesn't appear to be accounted for in the parts pdf's. '98 was of course the first year of production. I'm thinking that the quick disconnect would be for time savings on the final assembly production line if they did use it.
Are you determined to make it 100% factory? Otherwise, what purpose does a quick disconnect serve there for maintenance? The end of that supply pipe might be hard to get to to connect up with a clamp, so there's that.
I was thinking too that the quick disconnect could be for the factory to plug a machine to to do the initial fill and maybe purge the air? Or not.No, If I have to do so, I will just slip the hose over the end of the pipe and clamp it. the only thing I can figure is that since it is the inlet line to the core, having the fitting allows for a quick flush of just the core.