four wheeler radiator cools older cherokee

Jeep XJ Cherokees are known to run hot, especially when taxed for long periods of time by hill climbs or slow-speed rock crawling. However, despite the fact that our ’89 XJ’s 4.0L I-6 was a great-running engine, some hot summer days the coolant system was happy as could be; on other days when the weather was cooler, it might boil over. We knew the radiator was in good shape and not terribly old. It had a fairly fresh water pump, fan clutch, thermostat, coolant recovery tank and cap; and there seemed to be no discernable pattern between driving at highway speed, commuting around town, or slowly idling down a trail.

Read more at: http://www.fourwheeler.com/how-to/engine/1707-new-style-radiator-cools-older-xj-cherokee/