Few questions before cooling system maintenance

[Joseph]

The TJ's cooling system is self-bleeding within a short reasonable time of driving it, worst case. I've never done anything extra to bleed mine. Keep in mind that any air in the coolant is distributed in the coolant as it flows and once the coolant gets to the top hose the trapped air flows up the top hose into the top of the radiator. This is why there are no bleed instructions given in the FSM where instructions for changing the coolant are provided.

Squeezed the upper hose to burp it a bit is what I meant

 

[qslim]

I’ve bled the coolant on this thing a couple times but have never used the funnel and cap. Going to give it a try this time

Yeah they just make it a little easier & cleaner. Just attach the funnel to the top of the radiator, fill it and then leave a few inches of coolant in the funnel while all the bubbles burp out. When it's done you just stick that long plug/stick thing in the funnel to plug it, pull it off the radiator & dump the remaining coolant in the overflow bottle.

 

[glowell222]

Don't forget to change the radiator cap as well.