I have a 99 and ran without a shroud for quite awhile. I didn't really see a difference in the temps. I have a spectra radiator in my YJ and it works just fine. The main problem I have in my YJ is that the radiator cools off really fast when I park. Just a pain in the winter when I want some heat and have to wait after every stop.

 

I believe it’s FIXED.

I dont know know how to resize using the phone.

This is was taken at a light after driving 30 min straight on the highway at 75+mph at 2800-3k rpms with the AC on at all times.

It was the CSF Radiator. From what I understand, highway overheating is cause by plugged radiators, but this thing was new and coolant passages and coolant was clean. The problem was actually the material of the radiator. All copper brass, which if you see from the last post before this one, the guy complained it cooled too good after shutting off. The CSF copper radiator is made for locations where ambient temps are 50F or below basically at all times. It does not rust as quickly as aluminum and the material (copper/brass) retains heat (which is why it’s so great for heater cores). In my application, Arizona highway driving, copper is death.

if you are reading this and have overheating issues when it’s hot out and have a CSF radiator, CHANGE IT OUT IMMEDIATELY! The MOPAR HD cooling unit is cheaper than a CSF radiator and is made from aluminum. I will never buy another CSF radiator ever, oem or bust. I am suggesting others to avoid this company like the plague (unless you live in the North Pole).

Thank you guys for the help, I am still installing the shroud when it gets here, but the root of problem has been rectified.

 

The CSF copper radiator is made for locations where ambient temps are 50F or below basically at all times...

I haven't found that info on any of the sites that sell CSF radiators. Where did you find it?

 

Glad you got it fixed, dude. That is some good advice for people running copper radiators that are over heating after trying everything else.

 

It wasnt the brand, or the material that failed you. It was the guy or gal that put it together. You just happened to get that one. The only downside with copper and brass is the price. I have used both copper and brass, and aluminum. There was no difference in cooling.

 

That was my thought. Maybe a cold solder dip when they installed the tubes to the tank flanges got too much solder into the ends of the tubes and caused a partial blockage. Actually I've never seen a copper radiator. Only solid brass or aluminum. Even my 37 Dodge was brass. Now the replacement heater core I put in my WJ was copper tubes with brass end tanks and pipes.

 

Rockauto has it, Amazon has it, direct from the website has the info that ALL of their radiators are made from copper.

Edit: they don’t have that info on their site, this was a decision based on material. The OEM is aluminum and decided to go that route. Aluminum transfer heat better into air compared to copper.

 

Maybe, maybe not. It’s what worked for me, I mean, the OEM is aluminum for a reason. The gears were a coincidence as the ambient temp here in southern Arizona in early January to about spring has been below 60F, not until recently it has been over 70F. I had the CSF radiator for 3 months before this happened, so if it was bad it should’ve been this bad before also.

Btw I’ve been driving around all day, barely hit 210 with AC on at all times, all speeds.

take this info with a grain of salt, make the proper checks to your system and gather all the facts, assumptions is the biggest player in trying to diagnose and had me chasing my tail for a week.

thanks for the replies peeps.

 

I think his advice is your running a newish copper radiator and are over heating after you've:

Put in the proper T-stat
Your cooling fan is kicking on
Your clutch fan is working
Your water pump is replaced
All your hoses are good & not sucking closed
You don't have a cracked head
Not a blowed head gasket
You have no leaks
You've flushed everything
You've even got the fan shroud....haha

If your still over heating, maybe replacing the newish copper with aluminum will solve your over heating. What else would be left?

Obviously, if the copper radiator is old then replacing it with a new radiator would help or if it's faulty when new then replacing it with another one would help it.

 

Contact CSF they may want their piece back for R&D ...I know I would.

 

as I mentioned previously, if using the heater fixes the issue, that clearly points to ineffective radiator, for whatever reason, pure thermodynamics

that could include a defective design, construction, or partial clogging from silt or silicone

You must be well pleased with that outcome, being ready to shoot yr jeep & all

A/C is a must where I live, had to swap parts over from my smashed one to my present one, car sellers hate my obsession with A/C working...or minus $1000

 

This. And don’t assume something is good just because it’s new.