Expansion Tank Cap is C2P20325

I do not recommend a brass bleeder screw, that pipe is metal not plastic and dissimilar metals can cause corrosion and the screw to lock up.

Jaguar does not sell the bleeder screw separately but ones from BMW fit 17111712788
Another forum member has confirmed this aluminum one fits its just a tad longer then the factory jag one.
https://www.ecstuning.com/b-ecs-part.../003530ecs01a/

 

Thanks guys i just did the bleeding procedure, there was really not much air in there. I filled up took the car out for a drive, coolant level keeps dropping slightly.
I'm stuck at this point, don't know where it's going, one question if the leak test turned out fine no pressure lost during test could that mean head gasket? Internal leak?

Thermostat is closed, so probably won't know if it's going into the cylinders.
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After the car cooled down a bit i removed the cap i could hear some steam pressure release, the coolant level went up upon releasing the pressure just like it did when I did the pressure test.

 

Yesterday i topped up the coolant, did a 40 min drive got home, parked, checked coolant today after it's been sitting overnight, level is just where it was, no coolant loss, it's so weird, it's like it has it's mood.

Anyway I'll do a combustion gas leak test, impossible to get ones of those testers here but after researching i found out that aquarium CO2 test uses the same chemical, basically this leak test sniffs CO2.

​​​​​I'll get one of those, test it on the exhaust first see if it's reacts, it will probably work, they are very similar.

 

I’ve been told it’s more common with supercharged cars than normally aspirated cars.

by the way, do you still have the cover under the car still on

 

Yes I have the trays in place, but I'm pretty sure there are no extrenal leaks, pressure test would have revealed them.

I just hope for the best, hope it's not head gasket, which i don't think it is, doesn't overheat never has.

This car is so strange, one day it decides to be flawless, other it's an unthankful douchebag.

it's a love and hate relationship, some days it's puts a big smile on my face other days i think of getting rid of it, makes me bipolar.

My previous car Dodge Challenger was much more stable, that car was superb.

 

Just take that tray off and drive the car like you do… go home and then put a card board big enough under the car. You may pick up some drips that you can’t see with the tray on. That’s what I tried when I was looking for my leaks. You could always try the dye test also.

 

Ok guys so i tried the exhaust leak test, improvising with the aquarium test, stuff actually works it's the same chemical.

Please don't bash me over this test it's the only thing available here, it's not the appropriate tool but it's the same stuff as the leak test, it should be kind of the same thing.

​​​​​​I'm apparently good no head gasket leak.
Don't know if I had it enough time, if someone else has done this , how long time is recommended?

Coolant level haven't dropped in the last days, so again this is a mystery like everything with this car.

 

I wasn't fully convinced so researched a bit more, 5 minutes it's all it should take more than that it could turn green cause of the coolant vapors.

So i modified it a bit stuck a hose, drilled a release hole, and used a coolant bottle cap that fitted perfectly in the reservoir.

Had is there for a bit more than 5 minutes, after the engine was hot with open thermostat.
I'm pretty sure my head gasket is fine.

 

If the chemical used is the correct one, five minutes should be more than enough time to detect exhaust gasses escaping from the overflow reservoir. It would appear there is no problem with exhaust gasses passing by the head gasket(s).

 

Great I'm good then, the chemical i used works, i tried it directly on the exhaust turned yellow.

 

Since i can't find anything wrong, i started checking the cap.
My cap is rated 140 kpa, the part number stamped is 8W83-8101-AA, C2P17700.

The other part number C2P20325, is rated at 200kpa.
both seem to fit the XF, but there are more results for xfr with C2P20325 Cap.

Can anyone with a xfr please check their cap, maybe i have the wrong cap , or there's a newer revised one out there.

After sitting for a day the bottom of my cap is wet don't know if that is normal.
I pressed the spring metal piece in the middle, it seems jammed, needed a bit of force, after that it will depress freely.

 

According to my parts catalog there is a XF/XFR VIN split at R54396--from that number you need part no C2P20325.

 

MIne is R54542, not sure if I have the correct cap.

 

You need this cap

 

Good day if anybody has any tricks for any steps on how to properly remove air pockets from a 2012 Jaguar XF would really appreciate it my having issues

I located the bleeder valve I actually purchased a copper bleeder valve bolt

 

This was actually my problem, i didn't have a leak.
I bleed according to the workshop manual, bleeding screw. That wasn't actually so effective what did work was run the engine for a while turn off, wait a bit and open the cap, could hear a lot to air being released topped up coolant, did that a few times. Solved it.

 

Copy thank you for the quick response yeah I noticed that this car is very high pressure in the cooling system for some reason I don't have a supercharger but I'm going to try that and I'll follow up with you on my findings