Originally Posted by cruiser54

Yes. That is stock on your model. That's why I suggested replacing the cap on that bottle with the Napa 703-1396. It's all good.

If you really wanna bleed the system, do this:

Get it situated nose down. At the driver's side rear of the head is your temperature sending unit for the gauge. Unplug it. Using a 1/2" deep socket loosen that sender til coolant starts to come out with no air. Tighten it back in and plug it back in. Don't do it with the engine hot or you could get burned and be delicate with it. You don't wanna bust it off or something.

Me, I'd try the cap first.

Originally Posted by Outlaw Star

This is one way. Another way is to take the upper radiator hose off of the radiator, hold it up and pour coolant in there. That allows the coolant to flow into the block and the air inside the block will be released while filling.

Originally Posted by cruiser54

That's probably easier and less risky actually.

I have a confession to make. In my 12 years as Service Manager and Shop Foreman at a Jeep dealership, 6 of those years with the 4.0 Renix Jeeps and how ever many years I've worked on them since, myself and my techs NEVER bled a Renix cooling system.