I have a major coolant leak from behind engine and I suspect it is the "valley hose". Coolant comes right out. What is the part number to this and since I have to take out supercharger, what other parts should I replace? gaskets, hoses, etc... please list items and part number if available. I appreciate any help.

it's a 2007 XKR 75k miles

 

I recently posted on changing all coolant hoses on my 2007 XK including part numbers, but this is not the same as an XKR.
https://www.jaguarforums.com/forum/x...ervice-186165/

You can look at any Jaguar dealer's parts website to obtain part numbers. You will have to remove the intake manifold so you need the two gaskets for the manifold, plus the EGR pipe gasket and the throttle body gasket.

You may want to replace the engine coolant reservoir as a preventive measure, while replacing the hoses to the cabin heater core.