I am going to fit a header tank to my crossflow instead of the filler neck on the head.

I have the tank ready to fit and I have the fiesta thermostat housing to fit too. My questions are about the plumbing.

Do I..

A) Cut the pipe going from the inlet manfold to the water pump and plumb the tank inline with this, so the coolant flows though it.

B) Weld an outlet onto the top of the rad and plumb this to the top of the tank and plumb the lower pipe back into the bottom hose?

C) Plumb the outlet from the fiesta thermostat housing to the top of the tank and the bottom back into the bottom hose.

Any advice welcome

Shaun

Shaun,
I'm not familiar with the Xflow but on my Pinto + Polo rad + Sierra header tank setup I've plumbed it like this:

1. Stat (big) to rad upper
2. Rad Lower to a 32-15-32 T piece and on to the pump (big). The 15mm T stub connects to the bigger stub on the header (about 15/18mm ID)
3. From Inlet manifold straight to the pump (small). This would be the heater loop, but I don't have a heater.
4. Approx 8mm ID hoses in a T connecting the rad bleed, 'stat bleed and header tank overflow.
HTH
John.