Join Date: Sep 2005
Location: San Tan Valley Arizona
The cooling system of an XJ is it 's "Achille's heel." Whenever I do any repairs to that system, I always go for the best/biggest parts I can find to improve the system.
For radiators, I prefer good quality metal ones like CSF. I have had bad luck with OEM plastic/aluminum in the XJ, but that may have been a one-off issue with my Modine replacement.
For thermostats, use OEM or RobertShaw with the airvent.
Don't neglect the fan clutch. If it's more than 3-5 years old, replace it. It's pretty much impossible to test them effectively, and they tend to wear out within that time. On top of which, they are relatively cheap.
I don't own an XJ any longer, but I still think they are the best of all the Jeep products ever made. My XJ was my favorite vehicle in my 50+ years of driving.
So...I stick around and give advice.