Need to replace cooling system

[Smokeyyank]

 A while back when I was doing the headlight harness upgrade I noticed the radiator had a small pinhole leak in it. I currently do not have any overheating issues but want to be proactive so I don't. So question now is do I convert to an open cooling system or do I just replace the few parts and keep it closed? 

[jdog]

Personal preference really, if the closed is working and you don't have any issues replace with like radiator. If you want a radiator cap and there's more issues then just the radiator go open

[phatton]

I switched to an open system and the truck runs cooler than it use to.  It could be that the new radiator plays a big part, but I prefer the open system.

[Smokeyyank]

 Leaning towards open but the whole of ain't broke thing.......I'll more than likely swap it just wanting to gather options. 

[gogmorgo]

In theory you can also future proof with the later radiator and still leave it as a closed system just with added rad cap, leaving the option to go open in the future should you decide to do so.

[cruiser54]

I used to recommend leaving the closed system alone.

 

But, I don't anymore. The plastic pressure bottles available now are absolute junk. 

Take the opportunity to convert now. 

[89 MJ]

10/10 would recommend doing an open loop conversion. It is ridiculously easy. If you use a Renix 2.5 overflow tank, it looks factory too. 

[cruiser54]

https://www.jeepforum.com/threads/converting-closed-renix-system-to-open-but-have-questions.3685313/

[Smokeyyank]

Great, thanks for the info. 

 

As for rads I know it's kind of a crap shoot. 

 

Was looking at this one

 

https://www.mishimoto.com/1991-2001-jeep-cherokee-replacement-radiator.html

 

But any other ones to consider? 

 

I believe the parts needed are. 

-rad

-rad cap

-Overflow

-Thermostat housing from a 92+

 

I also plan to replace the water pump and hoses. 

[89 MJ]

Seems like you have it thought out well. I’m running the Mishimoto in my MJ, no regrets here!

[AZJeff]

I bought a CSF from Rock Auto about 3 years ago, and found the workmanship (and thus performance) to be totally accceptable.   I know that other guys have reported otherwise, but that has been my experience with both my current MJ and my previous XJ.

 

I am a big fan of the open cooling system because they are "self-burping" and thus the issue of air trapped in the cooling system seems to be non-existent.

[75sv1]

If you go with a 2 or 3 row, use a MOPAR Clutch fan. The After Market ones are a bit wider. So, no clearance with a 3 row radiator. I have been using the CFS 3 row brass or all metal for over 5 years. I learned the hard way about the aftermarket Clutch fans. That and Death Wobble. DW took out the motor mounts. So, the engine flopped forward. I did have that radiator repaired. But its sitting up stairs above the garage if needed.