2008 coolant leak below supercharger

Hi Team, I have been helped out through many historic threads for repairs on my previous jags. I now have a 2008 XJ sovereign which I think is called an X350. The car is factory fitted with a supercharger. The problem I have is a major coolant leak coming from what appears to be below the supercharger at the rear of the engine. Searching the threads I find information on a coolant hose that fails below the supercharger, but the thread relates to an S type vehicle and following the repair it seems it is slightly different to my model. Can anyone point me to a thread that covers this repair on my model. I am half way through getting the supercharger off and find the instructions I am following do not suit my vehicle!
Any help as always is most appreciated. Cheers George

Have a look here for some guidance

Thanks very much Peter,I carried out that exact process with disassembly and I have got it all apart. Now waiting for jaguar to come back with availability of parts. Interesting in my case the hose that fails on all the other threads I have read, is ok on mine. That’s the one from the front of the valley through to the TB. Its the return hose that goes back to the water pump that has failed. Its still in the same valley, and has a join about halfway under the valley where it reduces in hose size. This join in made by a plastic reducer that is crimped both sides. The plastic reducer has snapped in half! This is why I had a total coolant loss and not a weep to start to give me any warning. While I am waiting for price and availability from Jaguar, I am contemplating replacing the hoses with silicone hose. Obviously I cant duplicate the shape, but have thought of running silicone hose of the 3/4" size these hoses start at from the front of the valley and all the way to exit the rear of the valley where I will make an alloy reducer then continue the hose in the smaller size (also silicone ) in a larger arc to the Throttle body and EGR Valve respectively. Obviously I cant follow the original Factory path of the hoses as I wont be able to bend the silicone hose tightly, but it means I have a much better quality hose beneath the valley that shouldn’t fail again due to heat, and the reducing joins will be accessible (just!) at the rear of the motor without removing the entire supercharger assembly should the connection require service or attention. My only concern is why did Jaguar not do this? is there a reason the hoses change size in a specific place to reduce volume or flow maybe? I own a classic car and Hot Rod restoration business, our workshop is well equipped and to replace these hoses with aftermarket product is not a difficult job for us. We could also duplicate the hose in alloy following the factory path but it gets pretty tight in there to change the alloy back to a rubber connector to the TB and EGR valve. Any thoughts by anyone on the reason for the location of the hose reduction would be of interest. As this is one of my own personal cars and not a customer car I am quite happy to have a “Hot Rod” type of fix to improve a possible future failure, and price of genuine Jag parts versus my ability to reproduce them in Silicone will be a deciding factor. The car has only 47000KM on the clock but it is 13 years old now. Maybe its the age rather than mileage that’s effecting this hose life.

If you do go to a different arrangement please make sure you document with photos what you did and what you used as this will be invaluable for future reference.

Hi Robyn, Im also in NZ, I have still not heard back from Jaguar in relation to price and availability of factory hoses. I am going ahead with my idea to replace with silicone, the hose that runs from the water pump to the TB or EGR cant quite remember which, that currently runs below the supercharger has no need to be underneath there from what I can see. I intend redirecting this from the water pump to the right side of the motor in 19mm silicone then reducing size and route along the R inner guard (fender) to the rear before reconnecting. The other that starts from inside the front of the valley I will use 19mm Silicone and direct this all the way behind the supercharger before dropping in size with an alloy joiner/reducer. Both these then have joints that are accessible should any service be needed . The silicone hose beneath the supercharger has an operating temperature of 180 degrees C. If it gets hotter than that in there I think I have other problems, so the hose should be a considerable upgrade to factory option. The one along the inner guard will never look factory fitted, but I can live with this instead of taking all this apart again in the future. I like this car a lot so its one for the collection. I am doing this job at my leisure, its not needed as a daily driver so will document and photograph to be posted here when I’m finished. Any thoughts as to the reduction in hose size by Jaguar? flow or pressure, surely they have the luxury of making an inlet port match an outlet port in size so one hose would be sufficient. I have had it suggested that the larger hose is to allow extra expansion for surges, but I cant seem to find a factual example to back this up. Anyone got any thoughts to share?

Sorry George, no idea on why there is a reduction.
Whereabouts in NZ are you?

Hi Robin, we are just north of Auckland in Whangaripo Valley between Wellsford and Pakiri Beach., Valley Rod and Restoration is my business. We specialise in Classic car Restoration mostly American but have done some early Jags, MGs etc. We build Hot Rods and some race car fabrication. Only a small business but well equipped. Full machine shop through to panel and paint. I hope to have my Jag back together this week and will post all the details.

If it is back on the road by the 11th April we would love to have it at Lloyd Ellsmore Park with the other 100+ Jaguars (30 E Types) it will be mainly Club members cars but we are not exclusive and welcome any Jaguar to join us. I’ll be in the club Marquee for the most part of the day.