Maryland Cherokee Club
CF Veteran
Joined: Dec 2011
Posts: 4,006
Likes: 1
From: Pasadena, MD
Year: 1987
Model: Wagoneer
Engine: Renix 4.0
Open systems aren't a cure all for cooling issues with renix. If you aren't keeping up on it, an open system will overheat just as fast.
::CF Moderator::


Joined: Sep 2009
Posts: 3,495
Likes: 482
From: Glen Burnie, MD
Year: 2001
Model: Cherokee (XJ)
Engine: 4.0l
My jeep overheated on Sunday, in this nice weather.
Course, my radiator failed so I guess that's as good of an excuse as any.
I do have a new fan clutch on the way as my old one was way beyond shot.
Course, my radiator failed so I guess that's as good of an excuse as any.
I do have a new fan clutch on the way as my old one was way beyond shot.
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
Agreed, but if you overhaul the entire system like I did, you might as well convert to open for the ease of maintenance.
Senior Member
Joined: Sep 2012
Posts: 593
Likes: 1
From: Bel Air, MD
Year: 1994 and 1996
Model: Cherokee
CF Veteran
Joined: Dec 2011
Posts: 4,006
Likes: 1
From: Pasadena, MD
Year: 1987
Model: Wagoneer
Engine: Renix 4.0
I don't see any ease of maintenance... They are they same. Buy a pressure bottle at autozone with a lifetime guarantee and never have to buy one again. Lifetime warranty
I am curious about the pros from converting to open.
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
Also, the pressure bottle is a wear part. I'd prefer not to deal with that so I don't have to worry about needing a warranty.
Senior Member
Joined: Aug 2012
Posts: 732
Likes: 0
From: Westminster, MD
Year: 1988
Model: Cherokee
Engine: 4.0
Everything is new except for the bottle, every cap I put on doesn't seat right with the bottle, I'm getting a new tank with cap so I know it's made for that tank
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
Senior Member
Joined: Aug 2012
Posts: 732
Likes: 0
From: Westminster, MD
Year: 1988
Model: Cherokee
Engine: 4.0
Lifetime warranty is fine, but you can add fluid to an open system any time, and you don't have to bleed it or worry about air. Warranty has nothing to do with ease of maintenance.
Also, the pressure bottle is a wear part. I'd prefer not to deal with that so I don't have to worry about needing a warranty.
Senior Member
Joined: Aug 2012
Posts: 732
Likes: 0
From: Westminster, MD
Year: 1988
Model: Cherokee
Engine: 4.0
My heater valve blew on me in Texas, I replaced it and noticed my cap wouldn't screw on tightly. I bought a new cap and fixed it. But with all aftermarket caps the threads aren't the same as the bottles, one part number is universal to many different tanks


