Closed system to open whilst retaining closed rad?

[my2monkeys]

Has anyone installed rad cap in a closed system plumbing?
I want to ditch the expansion tank but I have a new 3 core all metal rad that I want to keep.

So maybe a Moroso or similar type of t fitting with a rad cap provision inline of top hose.

Any suggestions?

 

[Saudade]

I've not done it (still closed) but have seen it done. Yep, just "splice" in an inline filler neck in the upper hose. You'll still need an overflow tank.

 

[Black1990jeep]

I used this over flow tank...

https://www.oreillyauto.com/detail/c/dorman-oe-solutions/engine-cooling/coolant-recovery-tank--universal-/7372d3db0653/dorman-oe-solutions-coolant-recovery-tank/doe0/603001?pos=1

I removed the renix pressure tank, and the shelf for that tank. I then mounted this new overflow tank on the space freed up on the inner fender well in the engine bay (rear right corner, where the old pressure tank was) I used a piece of sheet metal screwed to the inner fender well in the engine bay to provide a mounting bracket for this new over flow tank. For me I was replacing the radiator so got one with a filler car. but there is no reason why you can not use your renix type radiator with a filler cap spliced into the upper hose.