for you guys that have a rad hose that loops up higher than the rad cap for whatever reason, you need a filler/bleeder at the highest point so there isnt any air in the system.
IMG_6622 by Joe Doh, on Flickr
I found a filler neck with a rad cap from a 2003 Dodge durango V8 that comes with clamps for about $21 (cheaper online) Dorman 902-305 Upper Radiator Hose Coolant Filler
IMG_6786 by Joe Doh, on Flickr
remember to buy a higher pressure rad cap for your rad, I used a 20psi cap on the rad and the original 16 psi cap on the filler neck. it also works with the recovery system if you have one.

I found a filler neck with a rad cap from a 2003 Dodge durango V8 that comes with clamps for about $21 (cheaper online) Dorman 902-305 Upper Radiator Hose Coolant Filler

remember to buy a higher pressure rad cap for your rad, I used a 20psi cap on the rad and the original 16 psi cap on the filler neck. it also works with the recovery system if you have one.