The coolant crossover o-rings are part no. 806933080, two required. The PCV/Coolant Hose Connector manifold (located under the a/c compressor is part no. 11821AA660. It comes complete with two new seals. I've bought both of these from Amazon as genuine Subaru parts so don't neglect to look there. Reference: 2014 Forester.

 

Do you have the part numbers for the o rings? Pcv and coolant crossover

 

Mr. Subaru on YT has a video on replacing those two o rings. Engine and any underbody fasteners should be replaced early and often if corroded. Anti seize is also a good idea.

 

yes I looked at two of his, and an other. The one for the '13 Impreza looked more under the hood like my 15 forester than the video he did for the '15 outback. Perhaps because the forester 15s started being sold every early, in spring 14.
I did not see him replacing bolts, not with same pipe corrosion, so I mentioned those. Also I think this job is very different, much easier, if you can have a couple of minutes with a helper for midpoint removal.

 

OK Job finished. Took me three hours taking my time and being methodical making a list of everything I did so I could reverse my list on re-assembly. I think someone who has taken plenum/upper off before could do this in 90 minutes easy.
I had a pal come over for 15 minutes midway to help with removal of old o-rings and install of new ones. A pal to help really made a difference in having one person pull up and back on crossover from only partially removed harnesses and hoses while the other worked the pick to get baked-on o-ring out. I did not remove the 27mm egr fitting as although I had a 1 1/16 open end to do that, it was seriously rusted on and did not move with a large amount of pressure, and I was able to lift crossover just enough anyway.
When looking for info/parts, keep in mind the crossover pipe is also called water manifold, Water Pipe and Pipe CP Water.

Supplies/parts I used for 2015 CVT non-turbo 2.5:
PBlaster "catalyst."
Brake cleaner to clean dirt, copious pblaster and coolant from top of engine
A couple of good quality picks. I had a cheap set from amazon and they bent up and did nothing. I also had a craftsman pick that worked way way better.
Mid/light ftlb torque wrench
2 Gallons of subaru pre-mix
OEM o-rings
OEM plenum gaskets 14035aa570 for mine
OEM replacement (4) bolts for water manifold/crossover 6x25x18 part number 808206040 ($7 for four at parts counter)
Felpro throttlebody gasket

Also, in addition to crossover o-rings being current problem, a couple of the outlet/inlet pipes integrated to it were obscenely corroded for a nine year old vehicle. I think in my case the entire pipe is liable to fail at some point. Labor on getting crossover completely out and new one in is probably additional 60 mins. Part is $300 list but available oem from some online subaru dealerships for $203

Also PCV valve is a bit easier to check and or replace at same time, BUT make sure you have new hose to that. My hose was utterly baked and not reusable. Autozone and advance auto did not have this in stock. In any case it was about $9 at dealer.

 

anyone have any idea as to part number for bolts to water manifold

2012-2018 Subaru Water Manifold 14050AA781 | Subaru Parts Store

2012-2018 Subaru part # 14050AA781 - Water Manifold

www.subaruparts.com

they are corroded to heck and I am not putting them back in.

 

sometimes the pvc union on the driver's side is brittle

 

But thank you for bringing that to my attention. I see videos where that is an issue.