This may sound dumb , but what is a Valley Hose. I have a coolant leak somewhere below the intake manifold on to the tray. You can see a hose that I think is the one leaking by looking under the intake manifold on the rear left hand side. The hose goes forward to the center of the engine and then turns to the right and goes under the intake manifold and seems to stop. I cannot find where it comes out on the right side and forward. Is this the valley hose?

Forgot. This is on my 2000 XK8.

Thanks guys.

 

It's one of the pair of hoses that hide below the inlet manifold. The one on the LHS (#2 in the pic) travels from the tee piece (NNE3944BA - #6) off the octopus to its connection on the block directly below the rear of the thermostat tower. They seem to fracture at this point. The part # is NNE3946CA:- you will need to take the inlet manifold off to replace this so change the other along with the tee while you're in there (NCA3945CD - #1)

 

They are referred to as HEATER FEED AND RETURN HOSES.

 

They get referred to as Valley Hoses because they sit in the valley between the two banks of cylinders.

 

This is very helpful. I was hoping I could just find the leak and maybe fix that and then replace the left knock sensor. However it looks like a major overhaul of the cooling and heating system. Thanks again the diagram was extremely helpful.

 

I believe it what a valley girl wears to High School? (panty-hose?)